diff --git a/Cargo.toml b/Cargo.toml
index fa63dc900..98684fceb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,50 +1,46 @@
-[package]
-name = "pica"
+[workspace]
+resolver = "2"
+default-members = ["pica-toolkit"]
+
+members = [
+    "pica-lint",
+    "pica-matcher",
+    "pica-path",
+    "pica-record",
+    "pica-select",
+    "pica-toolkit"
+]
+
+[workspace.package]
 version = "0.17.0"
 authors = ["Nico Wagner <n.wagner@dnb.de>"]
-edition = "2021"
 license = "MIT OR Unlicense"
-default-run = "pica"
+readme = "./README.md"
+keywords = ["PICA+", "code4lib"]
+edition = "2021"
 
-[dependencies]
-arrow2 = { version = "0.17", features = ["io_ipc", "io_ipc_compression"] }
-bstr = "1.5"
-clap = { version = "4.3", features = ["cargo", "derive", "wrap_help"] }
+[workspace.dependencies]
+pica-matcher = { version = "0.17", path = "./pica-matcher" }
+pica-path = { version = "0.17", path = "./pica-path" }
+pica-record = { version = "0.17", path = "./pica-record" }
+pica-select = { version = "0.17", path = "./pica-select" }
+
+anyhow = "1.0"
+arrow2 = "0.17"
+bstr = "1.6"
+chrono = { version = "0.4", default-features = false }
+clap = "4.3"
 clap_complete = "4.3"
 csv = "1.2"
-directories = "5.0"
 flate2 = "1.0"
 nom = "7.1"
-quick-xml = "0.29"
 rand = "0.8"
-regex = "1.8"
-serde = { version = "1.0", features = ["derive"] }
+regex = "1.9"
+serde = "1.0"
 serde_json = "1.0"
-strsim = "0.10"
-termcolor = "1.2"
+sha2 = "0.10"
+thiserror = "1.0"
 toml = "0.7"
-unicode-normalization = "0.1"
-
-pica-matcher = { version = "0.1", path = "pica-matcher" }
-pica-path = { version = "0.2", path = "pica-path" }
-pica-record = { version = "0.1", path = "pica-record" }
-pica-select = { version = "0.1", path = "pica-select" }
-
-[dev-dependencies]
-assert_cmd = "2.0"
-predicates = "3.0"
-quickcheck = "1.0"
-quickcheck_macros = "1.0"
-tempfile = "3.2"
-trycmd = "0.14"
-
-[lib]
-path = "src/lib.rs"
-name = "pica"
-
-[[bin]]
-path = "src/bin/pica/main.rs"
-name = "pica"
 
 [profile.release]
 codegen-units = 1
@@ -54,12 +50,3 @@ lto = true
 [profile.dev]
 debug = 0
 
-[workspace]
-
-members = [
-    "pica-lint",
-    "pica-matcher",
-    "pica-path",
-    "pica-record",
-    "pica-select"
-]
diff --git a/pica-lint/Cargo.toml b/pica-lint/Cargo.toml
index 2d6180671..cd128b618 100644
--- a/pica-lint/Cargo.toml
+++ b/pica-lint/Cargo.toml
@@ -1,23 +1,25 @@
 [package]
 name = "pica-lint"
 version = "0.1.0"
-edition = "2021"
-authors = ["Nico Wagner <n.wagner@dnb.de>"]
-license = "MIT OR Unlicense"
+authors.workspace = true
+license.workspace = true
+readme.workspace = true
+keywords.workspace = true
+edition.workspace = true
 
 [dependencies]
-anyhow = "1.0"
-bstr = "1.5"
-clap = { version = "4.3", features = ["cargo", "derive", "wrap_help"] }
-chrono = { version = "0.4", default-features = false, features = ["clock"] }
-csv = "1.2"
-flate2 = "1.0"
-indicatif = "0.17"
-once_cell = "1.17"
-serde = { version = "1.0", features = ["derive"] }
-sophia = "0.7"
-toml = "0.7"
+anyhow = { workspace = true }
+bstr = { workspace = true }
+chrono = { workspace = true, features = ["clock"] }
+clap = { workspace = true, features = ["cargo", "derive", "wrap_help"] }
+csv = { workspace = true }
+flate2 = { workspace = true }
+indicatif = { version = "0.17" }
+once_cell = { version = "1.17" }
+pica-matcher = { workspace = true, features = ["serde"] }
+pica-path = { workspace = true, features = ["serde"] }
+pica-record = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+sophia = { version = "0.7" }
+toml = { workspace = true }
 
-pica-matcher = { version = "0.1", path = "../pica-matcher", features = ["serde"] }
-pica-path = { version = "0.2", path = "../pica-path", features = ["serde"] }
-pica-record = { version = "0.1", path = "../pica-record" }
diff --git a/pica-matcher/CHANGELOG.md b/pica-matcher/CHANGELOG.md
deleted file mode 100644
index e4d809c5f..000000000
--- a/pica-matcher/CHANGELOG.md
+++ /dev/null
@@ -1,24 +0,0 @@
-# Changelog
-
-All notable changes to this crate will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
-### Added
-
-* #611 Allow negation of a field matcher in curly bracket notation
-* #612 Support of double quoted string literals
-
-## v0.1.0
-
-### Added
-
-* #539 Add `TagMatcher` matcher
-* #530 Add `OccurrenceMatcher` matcher
-* #541 Add `SubfieldMatcher` matcher
-* #547 Add `FieldMatcher` matcher
-* #548 Add `RecordMatcher` matcher
-* #549 Add `Deserialize` for `RecordMatcher`
diff --git a/pica-matcher/Cargo.toml b/pica-matcher/Cargo.toml
index ea5479ae2..c788fa070 100644
--- a/pica-matcher/Cargo.toml
+++ b/pica-matcher/Cargo.toml
@@ -1,20 +1,20 @@
 [package]
 name = "pica-matcher"
-version = "0.1.0"
-license = "MIT OR Unlicense"
-authors = ["Nico Wagner <n.wagner@dnb.de>"]
-include = ["src/**/*"]
-edition = "2021"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+readme.workspace = true
+keywords.workspace = true
+edition.workspace = true
 
 [dependencies]
-bstr = "1.5"
-nom = "7.1"
-regex = "1.8"
+bstr = { workspace = true }
+nom = { workspace = true }
+pica-record = { workspace = true }
+regex = { workspace = true }
+serde = { workspace = true, optional = true }
 strsim = "0.10"
-thiserror = "1.0"
-serde = { version = "1.0", optional = true }
-
-pica-record = { version = "0.1", path = "../pica-record" }
+thiserror = { workspace = true }
 
 [dev-dependencies]
 anyhow = "1.0"
diff --git a/pica-matcher/tests/record_matcher.rs b/pica-matcher/tests/record_matcher.rs
index 6b5adf71a..4930c8f3b 100644
--- a/pica-matcher/tests/record_matcher.rs
+++ b/pica-matcher/tests/record_matcher.rs
@@ -10,7 +10,7 @@ fn ada_lovelace() -> &'static [u8] {
     DATA.get_or_init(|| {
         let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
         let path = Path::new(&manifest_dir)
-            .join("../tests/data/119232022.dat");
+            .join("../pica-toolkit/tests/data/119232022.dat");
         eprintln!("{:?}", path);
         fs::read_to_string(&path).unwrap().as_bytes().to_vec()
     })
diff --git a/pica-path/CHANGELOG.md b/pica-path/CHANGELOG.md
deleted file mode 100644
index 2f686f4ac..000000000
--- a/pica-path/CHANGELOG.md
+++ /dev/null
@@ -1,29 +0,0 @@
-# Changelog
-
-All notable changes to this crate will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-
-## [UNRELEASED]
-
-
-## [v0.2.0] - 2023-03-23
-
-### Added
-
-* #577 Allow optional subfield matcher in a path expression
-* #596 Add set-builder notation for path expressions
-
-
-## [v0.1.0] - 2023-01-17
-
-### Added
-
-* #550 Add initial `pica-path` crate
-* #551 Implement `Deserialize` for `Path`
-
-### Fixed
-
-* #555 Use `first()` instead of `iter().next()`
diff --git a/pica-path/Cargo.toml b/pica-path/Cargo.toml
index ac6256e08..026761684 100644
--- a/pica-path/Cargo.toml
+++ b/pica-path/Cargo.toml
@@ -1,18 +1,19 @@
 [package]
 name = "pica-path"
-version = "0.2.0"
-edition = "2021"
-authors = ["Nico Wagner <n.wagner@dnb.de>"]
-license = "MIT OR Unlicense"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+readme.workspace = true
+keywords.workspace = true
+edition.workspace = true
 
 [dependencies]
-bstr = "1.5"
-nom = "7.1"
-thiserror = "1.0"
-serde = { version = "1.0", optional = true }
-
-pica-matcher = { version = "0.1", path = "../pica-matcher" }
-pica-record = { version = "0.1", path = "../pica-record" }
+bstr = { workspace = true }
+nom = { workspace = true }
+pica-matcher = { workspace = true }
+pica-record = { workspace = true }
+serde = { workspace = true, optional = true }
+thiserror = { workspace = true }
 
 [dev-dependencies]
 anyhow = "1.0"
diff --git a/pica-path/tests/path.rs b/pica-path/tests/path.rs
index e14a7e4a8..772e89c9d 100644
--- a/pica-path/tests/path.rs
+++ b/pica-path/tests/path.rs
@@ -12,7 +12,7 @@ fn ada_lovelace() -> &'static [u8] {
     DATA.get_or_init(|| {
         let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
         let path = Path::new(&manifest_dir)
-            .join("../tests/data/119232022.dat");
+            .join("../pica-toolkit/tests/data/119232022.dat");
         eprintln!("{:?}", path);
         fs::read_to_string(&path).unwrap().as_bytes().to_vec()
     })
diff --git a/pica-record/CHANGELOG.md b/pica-record/CHANGELOG.md
deleted file mode 100644
index 3a83cbdcb..000000000
--- a/pica-record/CHANGELOG.md
+++ /dev/null
@@ -1,39 +0,0 @@
-# Changelog
-
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-
-## [Unreleased]
-
-### Added
-
-* #625 Implement `Hash` for `ByteRecord`
-* #626 Implement `sha256` for `ByteRecord`
-
-## v0.1.0
-
-### Added
-
-* #521 Add `RecordRef::write_to` function
-* #520 Add `BufReadExt` extension trait
-* #528 Add `ByteRecord` writer API
-* #530 Add `raw_data` field (`ByteRecord`)
-* #562 Add `Reader` and `ReaderBuilder`
-
-### Fixed
-
-* #531 Fix wrong assert expression (`WriterBuilder`)
-
-## 0.1.0 - 2022-10-14
-
-### Added
-
-* #489 Add `ByteRecord` and `StringRecord`
-* #485 Add `Field` and `FieldRef`
-* #484 Add `OccurenceRef` and `OccurenceRef`
-* #487 Add `RecordRef` and `Record`
-* #481 Add `SubfieldRef` and `Subfield`
-* #483 Add `TagRef` and `Tag`
diff --git a/pica-record/Cargo.toml b/pica-record/Cargo.toml
index c154145a3..3e9f3ddb1 100644
--- a/pica-record/Cargo.toml
+++ b/pica-record/Cargo.toml
@@ -1,17 +1,18 @@
 [package]
 name = "pica-record"
-version = "0.1.0"
-license = "MIT OR Unlicense"
-authors = ["Nico Wagner <n.wagner@dnb.de>"]
-include = ["src/**/*"]
-edition = "2021"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+readme.workspace = true
+keywords.workspace = true
+edition.workspace = true
 
 [dependencies]
-bstr = "1.5"
-flate2 = "1.0"
-nom = "7.1"
-sha2 = "0.10"
-thiserror = "1.0"
+bstr = { workspace = true }
+flate2 = { workspace = true }
+nom = { workspace = true }
+sha2 = { workspace = true }
+thiserror = { workspace = true }
 
 [dev-dependencies]
 anyhow = "1.0"
diff --git a/pica-select/Cargo.toml b/pica-select/Cargo.toml
index 61de847f4..be317f1ec 100644
--- a/pica-select/Cargo.toml
+++ b/pica-select/Cargo.toml
@@ -1,19 +1,20 @@
 [package]
 name = "pica-select"
-version = "0.1.0"
-authors = ["Nico Wagner <n.wagner@dnb.de>"]
-edition = "2021"
-license = "MIT OR Unlicense"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+readme.workspace = true
+keywords.workspace = true
+edition.workspace = true
 
 [dependencies]
-thiserror = "1.0"
-nom = "7.1"
-
-pica-matcher = { version = "0.1", path = "../pica-matcher" }
-pica-path = { version = "0.2", path = "../pica-path" }
-pica-record = { version = "0.1", path = "../pica-record" }
+nom = { workspace = true }
+pica-matcher = { workspace = true }
+pica-path = { workspace = true }
+pica-record = { workspace = true }
+thiserror = { workspace = true }
 
 [dev-dependencies]
-bstr = "1.5"
+bstr = { workspace = true }
 nom-test-helpers = "6.1"
-anyhow = "1.0"
+anyhow = { workspace = true }
diff --git a/pica-toolkit/Cargo.toml b/pica-toolkit/Cargo.toml
new file mode 100644
index 000000000..e5248accc
--- /dev/null
+++ b/pica-toolkit/Cargo.toml
@@ -0,0 +1,43 @@
+[package]
+name = "pica-toolkit"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+readme.workspace = true
+keywords.workspace = true
+edition.workspace = true
+
+[dependencies]
+arrow2 = { workspace = true, features = ["io_ipc", "io_ipc_compression"] }
+bstr = { workspace = true }
+clap = { workspace = true, features = ["cargo", "derive", "wrap_help"] }
+clap_complete = { workspace = true }
+csv = { workspace = true }
+directories = { version = "5.0" }
+flate2 = { workspace = true }
+nom = { workspace = true }
+pica-matcher = { workspace = true }
+pica-path = { workspace = true }
+pica-record = { workspace = true }
+pica-select = { workspace = true }
+quick-xml = { version = "0.29" }
+rand = { workspace = true }
+regex = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+strsim = { version = "0.10" }
+termcolor = { version = "1.2" }
+toml = { workspace = true }
+unicode-normalization = { version = "0.1" }
+
+[dev-dependencies]
+assert_cmd = "2.0"
+predicates = "3.0"
+quickcheck = "1.0"
+quickcheck_macros = "1.0"
+tempfile = "3.2"
+trycmd = "0.14"
+
+[[bin]]
+path = "src/main.rs"
+name = "pica"
diff --git a/src/bin/pica/cli.rs b/pica-toolkit/src/cli.rs
similarity index 100%
rename from src/bin/pica/cli.rs
rename to pica-toolkit/src/cli.rs
diff --git a/src/bin/pica/commands/cat.rs b/pica-toolkit/src/commands/cat.rs
similarity index 100%
rename from src/bin/pica/commands/cat.rs
rename to pica-toolkit/src/commands/cat.rs
diff --git a/src/bin/pica/commands/completions.rs b/pica-toolkit/src/commands/completions.rs
similarity index 100%
rename from src/bin/pica/commands/completions.rs
rename to pica-toolkit/src/commands/completions.rs
diff --git a/src/bin/pica/commands/convert/binary.rs b/pica-toolkit/src/commands/convert/binary.rs
similarity index 100%
rename from src/bin/pica/commands/convert/binary.rs
rename to pica-toolkit/src/commands/convert/binary.rs
diff --git a/src/bin/pica/commands/convert/import.rs b/pica-toolkit/src/commands/convert/import.rs
similarity index 100%
rename from src/bin/pica/commands/convert/import.rs
rename to pica-toolkit/src/commands/convert/import.rs
diff --git a/src/bin/pica/commands/convert/json.rs b/pica-toolkit/src/commands/convert/json.rs
similarity index 100%
rename from src/bin/pica/commands/convert/json.rs
rename to pica-toolkit/src/commands/convert/json.rs
diff --git a/src/bin/pica/commands/convert/mod.rs b/pica-toolkit/src/commands/convert/mod.rs
similarity index 100%
rename from src/bin/pica/commands/convert/mod.rs
rename to pica-toolkit/src/commands/convert/mod.rs
diff --git a/src/bin/pica/commands/convert/plain.rs b/pica-toolkit/src/commands/convert/plain.rs
similarity index 100%
rename from src/bin/pica/commands/convert/plain.rs
rename to pica-toolkit/src/commands/convert/plain.rs
diff --git a/src/bin/pica/commands/convert/xml.rs b/pica-toolkit/src/commands/convert/xml.rs
similarity index 100%
rename from src/bin/pica/commands/convert/xml.rs
rename to pica-toolkit/src/commands/convert/xml.rs
diff --git a/src/bin/pica/commands/count.rs b/pica-toolkit/src/commands/count.rs
similarity index 100%
rename from src/bin/pica/commands/count.rs
rename to pica-toolkit/src/commands/count.rs
diff --git a/src/bin/pica/commands/filter.rs b/pica-toolkit/src/commands/filter.rs
similarity index 100%
rename from src/bin/pica/commands/filter.rs
rename to pica-toolkit/src/commands/filter.rs
diff --git a/src/bin/pica/commands/frequency.rs b/pica-toolkit/src/commands/frequency.rs
similarity index 100%
rename from src/bin/pica/commands/frequency.rs
rename to pica-toolkit/src/commands/frequency.rs
diff --git a/src/bin/pica/commands/hash.rs b/pica-toolkit/src/commands/hash.rs
similarity index 100%
rename from src/bin/pica/commands/hash.rs
rename to pica-toolkit/src/commands/hash.rs
diff --git a/src/bin/pica/commands/invalid.rs b/pica-toolkit/src/commands/invalid.rs
similarity index 100%
rename from src/bin/pica/commands/invalid.rs
rename to pica-toolkit/src/commands/invalid.rs
diff --git a/src/bin/pica/commands/mod.rs b/pica-toolkit/src/commands/mod.rs
similarity index 100%
rename from src/bin/pica/commands/mod.rs
rename to pica-toolkit/src/commands/mod.rs
diff --git a/src/bin/pica/commands/partition.rs b/pica-toolkit/src/commands/partition.rs
similarity index 100%
rename from src/bin/pica/commands/partition.rs
rename to pica-toolkit/src/commands/partition.rs
diff --git a/src/bin/pica/commands/print.rs b/pica-toolkit/src/commands/print.rs
similarity index 100%
rename from src/bin/pica/commands/print.rs
rename to pica-toolkit/src/commands/print.rs
diff --git a/src/bin/pica/commands/sample.rs b/pica-toolkit/src/commands/sample.rs
similarity index 100%
rename from src/bin/pica/commands/sample.rs
rename to pica-toolkit/src/commands/sample.rs
diff --git a/src/bin/pica/commands/select.rs b/pica-toolkit/src/commands/select.rs
similarity index 100%
rename from src/bin/pica/commands/select.rs
rename to pica-toolkit/src/commands/select.rs
diff --git a/src/bin/pica/commands/slice.rs b/pica-toolkit/src/commands/slice.rs
similarity index 100%
rename from src/bin/pica/commands/slice.rs
rename to pica-toolkit/src/commands/slice.rs
diff --git a/src/bin/pica/commands/split.rs b/pica-toolkit/src/commands/split.rs
similarity index 100%
rename from src/bin/pica/commands/split.rs
rename to pica-toolkit/src/commands/split.rs
diff --git a/src/bin/pica/common.rs b/pica-toolkit/src/common.rs
similarity index 100%
rename from src/bin/pica/common.rs
rename to pica-toolkit/src/common.rs
diff --git a/src/bin/pica/config.rs b/pica-toolkit/src/config.rs
similarity index 100%
rename from src/bin/pica/config.rs
rename to pica-toolkit/src/config.rs
diff --git a/src/bin/pica/macros.rs b/pica-toolkit/src/macros.rs
similarity index 100%
rename from src/bin/pica/macros.rs
rename to pica-toolkit/src/macros.rs
diff --git a/src/bin/pica/main.rs b/pica-toolkit/src/main.rs
similarity index 100%
rename from src/bin/pica/main.rs
rename to pica-toolkit/src/main.rs
diff --git a/src/bin/pica/translit.rs b/pica-toolkit/src/translit.rs
similarity index 100%
rename from src/bin/pica/translit.rs
rename to pica-toolkit/src/translit.rs
diff --git a/src/bin/pica/util.rs b/pica-toolkit/src/util.rs
similarity index 100%
rename from src/bin/pica/util.rs
rename to pica-toolkit/src/util.rs
diff --git a/tests/data/000008672.dat b/pica-toolkit/tests/data/000008672.dat
similarity index 100%
rename from tests/data/000008672.dat
rename to pica-toolkit/tests/data/000008672.dat
diff --git a/tests/data/000009229.dat b/pica-toolkit/tests/data/000009229.dat
similarity index 100%
rename from tests/data/000009229.dat
rename to pica-toolkit/tests/data/000009229.dat
diff --git a/tests/data/000016586.dat b/pica-toolkit/tests/data/000016586.dat
similarity index 100%
rename from tests/data/000016586.dat
rename to pica-toolkit/tests/data/000016586.dat
diff --git a/tests/data/000016756.dat b/pica-toolkit/tests/data/000016756.dat
similarity index 100%
rename from tests/data/000016756.dat
rename to pica-toolkit/tests/data/000016756.dat
diff --git a/tests/data/004732650-nfc.dat.gz b/pica-toolkit/tests/data/004732650-nfc.dat.gz
similarity index 100%
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rename from tests/snapshot/split/003-split-template.out/FOO_1.dat
rename to pica-toolkit/tests/snapshot/split/003-split-template.out/FOO_1.dat
diff --git a/tests/snapshot/split/003-split-template.out/FOO_2.dat b/pica-toolkit/tests/snapshot/split/003-split-template.out/FOO_2.dat
similarity index 100%
rename from tests/snapshot/split/003-split-template.out/FOO_2.dat
rename to pica-toolkit/tests/snapshot/split/003-split-template.out/FOO_2.dat
diff --git a/tests/snapshot/split/003-split-template.toml b/pica-toolkit/tests/snapshot/split/003-split-template.toml
similarity index 100%
rename from tests/snapshot/split/003-split-template.toml
rename to pica-toolkit/tests/snapshot/split/003-split-template.toml
diff --git a/tests/snapshot/split/004-split-skip-invalid-flag.in/0.dat b/pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/0.dat
similarity index 100%
rename from tests/snapshot/split/004-split-skip-invalid-flag.in/0.dat
rename to pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/0.dat
diff --git a/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_0.dat b/pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_0.dat
similarity index 100%
rename from tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_0.dat
rename to pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_0.dat
diff --git a/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_1.dat b/pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_1.dat
similarity index 100%
rename from tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_1.dat
rename to pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_1.dat
diff --git a/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_2.dat b/pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_2.dat
similarity index 100%
rename from tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_2.dat
rename to pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/FOO_2.dat
diff --git a/tests/snapshot/split/004-split-skip-invalid-flag.in/dump.dat.gz b/pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/dump.dat.gz
similarity index 100%
rename from tests/snapshot/split/004-split-skip-invalid-flag.in/dump.dat.gz
rename to pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.in/dump.dat.gz
diff --git a/tests/snapshot/split/004-split-skip-invalid-flag.toml b/pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.toml
similarity index 100%
rename from tests/snapshot/split/004-split-skip-invalid-flag.toml
rename to pica-toolkit/tests/snapshot/split/004-split-skip-invalid-flag.toml
diff --git a/tests/snapshot/split/005-split-skip-invalid-config1.in/Pica.toml b/pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.in/Pica.toml
similarity index 100%
rename from tests/snapshot/split/005-split-skip-invalid-config1.in/Pica.toml
rename to pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.in/Pica.toml
diff --git a/tests/snapshot/split/005-split-skip-invalid-config1.in/dump.dat.gz b/pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.in/dump.dat.gz
similarity index 100%
rename from tests/snapshot/split/005-split-skip-invalid-config1.in/dump.dat.gz
rename to pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.in/dump.dat.gz
diff --git a/tests/snapshot/split/005-split-skip-invalid-config1.out/0.dat b/pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.out/0.dat
similarity index 100%
rename from tests/snapshot/split/005-split-skip-invalid-config1.out/0.dat
rename to pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.out/0.dat
diff --git a/tests/snapshot/split/005-split-skip-invalid-config1.toml b/pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.toml
similarity index 100%
rename from tests/snapshot/split/005-split-skip-invalid-config1.toml
rename to pica-toolkit/tests/snapshot/split/005-split-skip-invalid-config1.toml
diff --git a/tests/snapshot/split/006-split-skip-invalid-config2.in/Pica.toml b/pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.in/Pica.toml
similarity index 100%
rename from tests/snapshot/split/006-split-skip-invalid-config2.in/Pica.toml
rename to pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.in/Pica.toml
diff --git a/tests/snapshot/split/006-split-skip-invalid-config2.in/dump.dat.gz b/pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.in/dump.dat.gz
similarity index 100%
rename from tests/snapshot/split/006-split-skip-invalid-config2.in/dump.dat.gz
rename to pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.in/dump.dat.gz
diff --git a/tests/snapshot/split/006-split-skip-invalid-config2.out/0.dat b/pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.out/0.dat
similarity index 100%
rename from tests/snapshot/split/006-split-skip-invalid-config2.out/0.dat
rename to pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.out/0.dat
diff --git a/tests/snapshot/split/006-split-skip-invalid-config2.toml b/pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.toml
similarity index 100%
rename from tests/snapshot/split/006-split-skip-invalid-config2.toml
rename to pica-toolkit/tests/snapshot/split/006-split-skip-invalid-config2.toml
diff --git a/tests/snapshot/split/007-split-skip-invalid-config3.in/Pica.toml b/pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.in/Pica.toml
similarity index 100%
rename from tests/snapshot/split/007-split-skip-invalid-config3.in/Pica.toml
rename to pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.in/Pica.toml
diff --git a/tests/snapshot/split/007-split-skip-invalid-config3.in/dump.dat.gz b/pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.in/dump.dat.gz
similarity index 100%
rename from tests/snapshot/split/007-split-skip-invalid-config3.in/dump.dat.gz
rename to pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.in/dump.dat.gz
diff --git a/tests/snapshot/split/007-split-skip-invalid-config3.out/0.dat b/pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.out/0.dat
similarity index 100%
rename from tests/snapshot/split/007-split-skip-invalid-config3.out/0.dat
rename to pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.out/0.dat
diff --git a/tests/snapshot/split/007-split-skip-invalid-config3.toml b/pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.toml
similarity index 100%
rename from tests/snapshot/split/007-split-skip-invalid-config3.toml
rename to pica-toolkit/tests/snapshot/split/007-split-skip-invalid-config3.toml
diff --git a/tests/snapshot/split/008-split-skip-invalid-config4.in/Pica.toml b/pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.in/Pica.toml
similarity index 100%
rename from tests/snapshot/split/008-split-skip-invalid-config4.in/Pica.toml
rename to pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.in/Pica.toml
diff --git a/tests/snapshot/split/008-split-skip-invalid-config4.in/dump.dat.gz b/pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.in/dump.dat.gz
similarity index 100%
rename from tests/snapshot/split/008-split-skip-invalid-config4.in/dump.dat.gz
rename to pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.in/dump.dat.gz
diff --git a/tests/snapshot/split/008-split-skip-invalid-config4.out/0.dat b/pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.out/0.dat
similarity index 100%
rename from tests/snapshot/split/008-split-skip-invalid-config4.out/0.dat
rename to pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.out/0.dat
diff --git a/tests/snapshot/split/008-split-skip-invalid-config4.toml b/pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.toml
similarity index 100%
rename from tests/snapshot/split/008-split-skip-invalid-config4.toml
rename to pica-toolkit/tests/snapshot/split/008-split-skip-invalid-config4.toml
diff --git a/src/error.rs b/src/error.rs
deleted file mode 100644
index 9dc509f61..000000000
--- a/src/error.rs
+++ /dev/null
@@ -1,71 +0,0 @@
-use std::fmt::{self, Display, Formatter};
-use std::{error, io};
-
-use crate::parser::{ParsePathError, ParsePicaError};
-
-/// A type alias for `Result<T, pica::Error>`.
-pub type Result<T> = std::result::Result<T, Error>;
-
-/// An error that can occur when processing PICA+ data.
-#[derive(Debug)]
-pub enum Error {
-    InvalidTag(String),
-    InvalidOccurrence(String),
-    InvalidOccurrenceMatcher(String),
-    InvalidSubfield(String),
-    InvalidSubfieldMatcher(String),
-    InvalidSubfieldsMatcher(String),
-    InvalidField(String),
-    InvalidFieldMatcher(String),
-    InvalidRecord(ParsePicaError),
-    InvalidPath(ParsePathError),
-    InvalidMatcher(String),
-    Utf8Error(std::str::Utf8Error),
-    Io(io::Error),
-}
-
-impl error::Error for Error {}
-
-impl Display for Error {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        match *self {
-            Self::InvalidTag(ref m) => f.write_str(m),
-            Self::InvalidOccurrence(ref m) => f.write_str(m),
-            Self::InvalidOccurrenceMatcher(ref m) => f.write_str(m),
-            Self::InvalidSubfield(ref m) => f.write_str(m),
-            Self::InvalidSubfieldMatcher(ref m) => f.write_str(m),
-            Self::InvalidSubfieldsMatcher(ref m) => f.write_str(m),
-            Self::InvalidField(ref m) => f.write_str(m),
-            Self::InvalidFieldMatcher(ref m) => f.write_str(m),
-            Self::InvalidMatcher(ref m) => f.write_str(m),
-            Error::InvalidRecord(ref e) => e.fmt(f),
-            Error::InvalidPath(ref e) => e.fmt(f),
-            Error::Utf8Error(ref e) => e.fmt(f),
-            Error::Io(ref e) => e.fmt(f),
-        }
-    }
-}
-
-impl From<io::Error> for Error {
-    fn from(err: io::Error) -> Self {
-        Self::Io(err)
-    }
-}
-
-impl From<ParsePicaError> for Error {
-    fn from(err: ParsePicaError) -> Self {
-        Self::InvalidRecord(err)
-    }
-}
-
-impl From<ParsePathError> for Error {
-    fn from(err: ParsePathError) -> Self {
-        Self::InvalidPath(err)
-    }
-}
-
-impl From<std::str::Utf8Error> for Error {
-    fn from(err: std::str::Utf8Error) -> Self {
-        Self::Utf8Error(err)
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
deleted file mode 100644
index 8b1378917..000000000
--- a/src/lib.rs
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/src/matcher/common.rs b/src/matcher/common.rs
deleted file mode 100644
index e029c8cff..000000000
--- a/src/matcher/common.rs
+++ /dev/null
@@ -1,166 +0,0 @@
-use std::fmt;
-
-use nom::branch::alt;
-use nom::bytes::complete::tag;
-use nom::combinator::value;
-
-use crate::common::ParseResult;
-
-/// Boolean Operators.
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub enum BooleanOp {
-    And, // and, "&&"
-    Or,  // or, "||"
-}
-
-impl fmt::Display for BooleanOp {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            Self::And => write!(f, "&&"),
-            Self::Or => write!(f, "||"),
-        }
-    }
-}
-
-/// Comparison Operators
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub enum ComparisonOp {
-    Eq,         // equal, "=="
-    Ne,         // not equal, "!="
-    Gt,         // greater than, ">"
-    Ge,         // greater than or equal, ">="
-    Lt,         // less than, "<"
-    Le,         // less than or equal, "<="
-    StartsWith, // starts with, "=^"
-    EndsWith,   // ends with, "=$"
-    Similar,    // similar, "=*"
-}
-
-impl fmt::Display for ComparisonOp {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            Self::Eq => write!(f, "=="),
-            Self::Ne => write!(f, "!="),
-            Self::Gt => write!(f, ">"),
-            Self::Ge => write!(f, ">="),
-            Self::Lt => write!(f, "<"),
-            Self::Le => write!(f, "<="),
-            Self::StartsWith => write!(f, "=^"),
-            Self::EndsWith => write!(f, "=$"),
-            Self::Similar => write!(f, "=*"),
-        }
-    }
-}
-
-/// Parses comparison operator for byte strings.
-pub(crate) fn parse_comparison_op_bstring(
-    i: &[u8],
-) -> ParseResult<ComparisonOp> {
-    alt((
-        value(ComparisonOp::Eq, tag("==")),
-        value(ComparisonOp::Ne, tag("!=")),
-        value(ComparisonOp::StartsWith, tag("=^")),
-        value(ComparisonOp::EndsWith, tag("=$")),
-        value(ComparisonOp::Similar, tag("=*")),
-    ))(i)
-}
-
-/// Parses comparison operator for usize.
-pub(crate) fn parse_comparison_op_usize(
-    i: &[u8],
-) -> ParseResult<ComparisonOp> {
-    alt((
-        value(ComparisonOp::Eq, tag("==")),
-        value(ComparisonOp::Ne, tag("!=")),
-        value(ComparisonOp::Ge, tag(">=")),
-        value(ComparisonOp::Gt, tag(">")),
-        value(ComparisonOp::Le, tag("<=")),
-        value(ComparisonOp::Lt, tag("<")),
-    ))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_parse_comparison_op() -> TestResult {
-        // bstring
-        assert_eq!(
-            parse_comparison_op_bstring(b"==")?.1,
-            ComparisonOp::Eq
-        );
-        assert_eq!(
-            parse_comparison_op_bstring(b"!=")?.1,
-            ComparisonOp::Ne
-        );
-        assert_eq!(
-            parse_comparison_op_bstring(b"=^")?.1,
-            ComparisonOp::StartsWith
-        );
-        assert_eq!(
-            parse_comparison_op_bstring(b"=$")?.1,
-            ComparisonOp::EndsWith
-        );
-
-        assert!(parse_comparison_op_bstring(b">=").is_err());
-        assert!(parse_comparison_op_bstring(b">").is_err());
-        assert!(parse_comparison_op_bstring(b"<=").is_err());
-        assert!(parse_comparison_op_bstring(b"<").is_err());
-
-        // usize
-        assert_eq!(
-            parse_comparison_op_usize(b"==")?.1,
-            ComparisonOp::Eq
-        );
-        assert_eq!(
-            parse_comparison_op_usize(b"!=")?.1,
-            ComparisonOp::Ne
-        );
-        assert_eq!(
-            parse_comparison_op_usize(b">=")?.1,
-            ComparisonOp::Ge
-        );
-        assert_eq!(
-            parse_comparison_op_usize(b">")?.1,
-            ComparisonOp::Gt
-        );
-        assert_eq!(
-            parse_comparison_op_usize(b"<=")?.1,
-            ComparisonOp::Le
-        );
-        assert_eq!(
-            parse_comparison_op_usize(b"<")?.1,
-            ComparisonOp::Lt
-        );
-
-        assert!(parse_comparison_op_usize(b"=^").is_err());
-        assert!(parse_comparison_op_usize(b"=$").is_err());
-        assert!(parse_comparison_op_usize(b"=~").is_err());
-        assert!(parse_comparison_op_usize(b"=*").is_err());
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_boolean_op_to_string() -> TestResult {
-        assert_eq!(BooleanOp::And.to_string(), "&&");
-        assert_eq!(BooleanOp::Or.to_string(), "||");
-        Ok(())
-    }
-
-    #[test]
-    fn test_comparison_op_to_string() -> TestResult {
-        assert_eq!(ComparisonOp::Eq.to_string(), "==");
-        assert_eq!(ComparisonOp::Ne.to_string(), "!=");
-        assert_eq!(ComparisonOp::Gt.to_string(), ">");
-        assert_eq!(ComparisonOp::Ge.to_string(), ">=");
-        assert_eq!(ComparisonOp::Lt.to_string(), "<");
-        assert_eq!(ComparisonOp::Le.to_string(), "<=");
-        assert_eq!(ComparisonOp::StartsWith.to_string(), "=^");
-        assert_eq!(ComparisonOp::EndsWith.to_string(), "=$");
-        assert_eq!(ComparisonOp::Similar.to_string(), "=*");
-        Ok(())
-    }
-}
diff --git a/src/matcher/field_matcher.rs b/src/matcher/field_matcher.rs
deleted file mode 100644
index 1f2adeb87..000000000
--- a/src/matcher/field_matcher.rs
+++ /dev/null
@@ -1,257 +0,0 @@
-use std::fmt;
-
-use nom::branch::alt;
-use nom::character::complete::char;
-use nom::combinator::{all_consuming, cut, map, opt};
-use nom::sequence::{pair, preceded, terminated, tuple};
-use nom::Finish;
-
-use crate::common::{ws, ParseResult};
-use crate::matcher::{
-    parse_occurrence_matcher, parse_subfield_list_matcher,
-    parse_subfield_list_matcher_singleton, parse_tag_matcher,
-    MatcherFlags, OccurrenceMatcher, SubfieldListMatcher, TagMatcher,
-};
-use crate::{Error, Field};
-
-#[derive(Debug, PartialEq)]
-pub enum FieldMatcher {
-    Subield(TagMatcher, OccurrenceMatcher, SubfieldListMatcher),
-    Exists(TagMatcher, OccurrenceMatcher),
-}
-
-impl fmt::Display for FieldMatcher {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Subield(t, o, SubfieldListMatcher::Singleton(s)) => {
-                write!(f, "{t}{o}.{s}")
-            }
-            Self::Subield(t, o, s) => write!(f, "{t}{o}{{{s}}}"),
-            Self::Exists(t, o) => write!(f, "{t}{o}?"),
-        }
-    }
-}
-
-impl FieldMatcher {
-    /// Creates a field matcher from a string slice.
-    ///
-    /// If an invalid field matcher is given, an error is returned.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::FieldMatcher;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     assert!(FieldMatcher::new("012A/*{0? && 0 == 'abc'}").is_ok());
-    ///     assert!(FieldMatcher::new("012A/!{0 == 'abc'}").is_err());
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn new<S: AsRef<str>>(data: S) -> Result<Self, Error> {
-        let data = data.as_ref();
-
-        match all_consuming(parse_field_matcher)(data.as_bytes())
-            .finish()
-        {
-            Ok((_, matcher)) => Ok(matcher),
-            Err(_) => Err(Error::InvalidMatcher(format!(
-                "Expected valid field matcher, got '{data}'"
-            ))),
-        }
-    }
-
-    /// Returns true, if and only if the given field matches against
-    /// the field matcher.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use std::str::FromStr;
-    ///
-    /// use pica::matcher::{FieldMatcher, MatcherFlags};
-    /// use pica::Field;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     let matcher = FieldMatcher::new("012A/*{0? && 0 == 'abc'}")?;
-    ///     let field = Field::from_str("012A/01 \x1f0abc\x1e")?;
-    ///     assert!(matcher.is_match(&field, &MatcherFlags::default()));
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn is_match(
-        &self,
-        field: &Field,
-        flags: &MatcherFlags,
-    ) -> bool {
-        match self {
-            Self::Subield(tag, occurrence, subfield) => {
-                tag.is_match(field.tag())
-                    && occurrence.is_match(field.occurrence())
-                    && subfield.is_match(field.subfields(), flags)
-            }
-            Self::Exists(tag, occurrence) => {
-                tag.is_match(field.tag())
-                    && occurrence.is_match(field.occurrence())
-            }
-        }
-    }
-}
-
-fn parse_field_matcher_subfield(i: &[u8]) -> ParseResult<FieldMatcher> {
-    map(
-        tuple((
-            parse_tag_matcher,
-            parse_occurrence_matcher,
-            alt((
-                map(
-                    pair(
-                        opt(alt((char('.'), ws(char('$'))))),
-                        parse_subfield_list_matcher_singleton,
-                    ),
-                    |(_prefix, matcher)| matcher,
-                ),
-                preceded(
-                    ws(char('{')),
-                    cut(terminated(
-                        parse_subfield_list_matcher,
-                        ws(char('}')),
-                    )),
-                ),
-            )),
-        )),
-        |(tag, occurrence, subfields)| {
-            FieldMatcher::Subield(tag, occurrence, subfields)
-        },
-    )(i)
-}
-
-pub(crate) fn parse_field_matcher_exists(
-    i: &[u8],
-) -> ParseResult<FieldMatcher> {
-    map(
-        terminated(
-            pair(ws(parse_tag_matcher), parse_occurrence_matcher),
-            ws(char('?')),
-        ),
-        |(t, o)| FieldMatcher::Exists(t, o),
-    )(i)
-}
-
-pub(crate) fn parse_field_matcher(
-    i: &[u8],
-) -> ParseResult<FieldMatcher> {
-    alt((parse_field_matcher_subfield, parse_field_matcher_exists))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use std::str::FromStr;
-
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_field_matcher_invalid() -> TestResult {
-        assert!(FieldMatcher::new("012A§?").is_err());
-        Ok(())
-    }
-
-    #[test]
-    fn test_field_matcher_exists() -> TestResult {
-        let matcher = FieldMatcher::new("012A?")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("013A?")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(!matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A/00?")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A/01?")?;
-        let field = Field::from_str("012A/01 \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A/01?")?;
-        let field = Field::from_str("012A/02 \x1f0abc\x1e")?;
-        assert!(!matcher.is_match(&field, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_field_matcher_subfield_dot() -> TestResult {
-        let matcher = FieldMatcher::new("012A.0 == 'abc'")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A{0 == 'abc'}")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A/01{0 == 'abc'}")?;
-        let field = Field::from_str("012A/01 \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A{0 == 'abc' && 9?}")?;
-        let field = Field::from_str("012A \x1f0abc\x1f9123\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        assert!(FieldMatcher::new("012A .0 == 'abc'").is_err());
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_field_matcher_subfield_dollar() -> TestResult {
-        let matcher = FieldMatcher::new("012A$0 == 'abc'")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012A $0 != 'def'")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_field_matcher_subfield_lazy() -> TestResult {
-        let matcher = FieldMatcher::new("012A0 == 'abc'")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        let matcher = FieldMatcher::new("012Aa0 == 'abc'")?;
-        let field = Field::from_str("012A \x1f0abc\x1e")?;
-        assert!(matcher.is_match(&field, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_field_matcher_to_string() -> TestResult {
-        let values = vec![
-            ("012A.a == 'abc'", "012A.a == 'abc'"),
-            ("012A/*{a == 'abc'}", "012A/*.a == 'abc'"),
-            (
-                "012A/01-03{ a == 'abc' && b == 'def' }",
-                "012A/01-03{a == 'abc' && b == 'def'}",
-            ),
-            ("012A?", "012A?"),
-        ];
-
-        for (matcher, expected) in values {
-            assert_eq!(
-                FieldMatcher::new(matcher)?.to_string(),
-                expected
-            );
-        }
-
-        Ok(())
-    }
-}
diff --git a/src/matcher/flags.rs b/src/matcher/flags.rs
deleted file mode 100644
index 82f115b6c..000000000
--- a/src/matcher/flags.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-#[derive(Debug)]
-pub struct MatcherFlags {
-    pub ignore_case: bool,
-    pub strsim_threshold: f64,
-}
-
-impl Default for MatcherFlags {
-    fn default() -> Self {
-        Self {
-            ignore_case: false,
-            strsim_threshold: 0.8,
-        }
-    }
-}
-
-impl MatcherFlags {
-    pub fn new() -> Self {
-        MatcherFlags::default()
-    }
-
-    #[must_use]
-    pub fn ignore_case(mut self, yes: bool) -> Self {
-        self.ignore_case = yes;
-        self
-    }
-
-    #[must_use]
-    pub fn strsim_threshold(mut self, threshold: f64) -> Self {
-        self.strsim_threshold = threshold;
-        self
-    }
-}
diff --git a/src/matcher/mod.rs b/src/matcher/mod.rs
deleted file mode 100644
index d28adce15..000000000
--- a/src/matcher/mod.rs
+++ /dev/null
@@ -1,29 +0,0 @@
-mod common;
-mod field_matcher;
-mod flags;
-mod occurrence_matcher;
-mod record_matcher;
-mod subfield_list_matcher;
-mod subfield_matcher;
-mod tag_matcher;
-
-pub(crate) use common::{
-    parse_comparison_op_bstring, parse_comparison_op_usize,
-};
-pub use common::{BooleanOp, ComparisonOp};
-pub use field_matcher::FieldMatcher;
-pub(crate) use field_matcher::{
-    parse_field_matcher, parse_field_matcher_exists,
-};
-pub use flags::MatcherFlags;
-pub(crate) use occurrence_matcher::parse_occurrence_matcher;
-pub use occurrence_matcher::OccurrenceMatcher;
-pub use record_matcher::RecordMatcher;
-pub use subfield_list_matcher::SubfieldListMatcher;
-pub(crate) use subfield_list_matcher::{
-    parse_subfield_list_matcher, parse_subfield_list_matcher_singleton,
-};
-pub(crate) use subfield_matcher::parse_subfield_matcher;
-pub use subfield_matcher::SubfieldMatcher;
-pub(crate) use tag_matcher::parse_tag_matcher;
-pub use tag_matcher::TagMatcher;
diff --git a/src/matcher/occurrence_matcher.rs b/src/matcher/occurrence_matcher.rs
deleted file mode 100644
index 57e9d423b..000000000
--- a/src/matcher/occurrence_matcher.rs
+++ /dev/null
@@ -1,220 +0,0 @@
-use std::fmt;
-
-use nom::branch::alt;
-use nom::bytes::complete::tag;
-use nom::character::complete::char;
-use nom::combinator::{
-    all_consuming, cut, map, success, value, verify,
-};
-use nom::sequence::{preceded, separated_pair};
-use nom::Finish;
-
-use crate::common::ParseResult;
-use crate::occurrence::{parse_occurrence_digits, Occurrence};
-use crate::Error;
-
-#[derive(Debug, PartialEq, Eq, Clone)]
-pub enum OccurrenceMatcher {
-    Some(Occurrence),
-    Range(Occurrence, Occurrence),
-    Any,
-    None,
-}
-
-impl fmt::Display for OccurrenceMatcher {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Some(o) => write!(f, "/{o}"),
-            Self::Range(from, to) => write!(f, "/{from}-{to}"),
-            Self::Any => write!(f, "/*"),
-            Self::None => write!(f, ""),
-        }
-    }
-}
-
-impl OccurrenceMatcher {
-    /// Creates a occurrence matcher from a string slice.
-    ///
-    /// If an invalid occurrence matcher is given, an error is returned.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::OccurrenceMatcher;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     assert!(OccurrenceMatcher::new("/01").is_ok());
-    ///     assert!(OccurrenceMatcher::new("/01-09").is_ok());
-    ///     assert!(OccurrenceMatcher::new("/*").is_ok());
-    ///     assert!(OccurrenceMatcher::new("").is_ok());
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn new<S: AsRef<str>>(data: S) -> Result<Self, Error> {
-        let data = data.as_ref();
-
-        match all_consuming(parse_occurrence_matcher)(data.as_bytes())
-            .finish()
-        {
-            Ok((_, matcher)) => Ok(matcher),
-            Err(_) => Err(Error::InvalidMatcher(format!(
-                "Expected valid occurrence matcher, got '{data}'"
-            ))),
-        }
-    }
-
-    /// Returns true, if and only if the given value matches against
-    /// the occurrence matcher.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::OccurrenceMatcher;
-    /// use pica::Occurrence;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     let matcher = OccurrenceMatcher::new("/01-09")?;
-    ///     assert!(matcher.is_match(Some(&Occurrence::new("03")?)));
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn is_match(&self, occurrence: Option<&Occurrence>) -> bool {
-        match occurrence {
-            Some(occurrence) => match self {
-                OccurrenceMatcher::Any => true,
-                OccurrenceMatcher::None => occurrence == "00",
-                OccurrenceMatcher::Some(rhs) => occurrence == rhs,
-                OccurrenceMatcher::Range(min, max) => {
-                    (occurrence >= min) && (occurrence <= max)
-                }
-            },
-            None => {
-                matches!(
-                    self,
-                    OccurrenceMatcher::Any | OccurrenceMatcher::None
-                )
-            }
-        }
-    }
-}
-
-impl From<Occurrence> for OccurrenceMatcher {
-    fn from(occurrence: Occurrence) -> Self {
-        Self::Some(occurrence)
-    }
-}
-
-pub(crate) fn parse_occurrence_matcher(
-    i: &[u8],
-) -> ParseResult<OccurrenceMatcher> {
-    alt((
-        preceded(
-            char('/'),
-            cut(alt((
-                map(
-                    verify(
-                        separated_pair(
-                            parse_occurrence_digits,
-                            char('-'),
-                            parse_occurrence_digits,
-                        ),
-                        |(min, max)| {
-                            min.len() == max.len() && min < max
-                        },
-                    ),
-                    |(min, max)| {
-                        OccurrenceMatcher::Range(
-                            Occurrence::from_unchecked(min),
-                            Occurrence::from_unchecked(max),
-                        )
-                    },
-                ),
-                map(
-                    verify(parse_occurrence_digits, |x: &[u8]| {
-                        x != b"00"
-                    }),
-                    |x| {
-                        OccurrenceMatcher::Some(
-                            Occurrence::from_unchecked(x),
-                        )
-                    },
-                ),
-                value(OccurrenceMatcher::None, tag("00")),
-                value(OccurrenceMatcher::Any, char('*')),
-            ))),
-        ),
-        success(OccurrenceMatcher::None),
-    ))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_occurrence_matcher() -> TestResult {
-        // Some
-        let matcher = OccurrenceMatcher::new("/03")?;
-        assert!(!matcher.is_match(Some(&Occurrence::new("00")?)));
-        assert!(!matcher.is_match(Some(&Occurrence::new("02")?)));
-        assert!(matcher.is_match(Some(&Occurrence::new("03")?)));
-        assert!(!matcher.is_match(Some(&Occurrence::new("04")?)));
-
-        // Range
-        let matcher = OccurrenceMatcher::new("/03-05")?;
-        assert!(!matcher.is_match(Some(&Occurrence::new("00")?)));
-        assert!(!matcher.is_match(Some(&Occurrence::new("02")?)));
-        assert!(matcher.is_match(Some(&Occurrence::new("03")?)));
-        assert!(matcher.is_match(Some(&Occurrence::new("04")?)));
-        assert!(matcher.is_match(Some(&Occurrence::new("05")?)));
-        assert!(!matcher.is_match(Some(&Occurrence::new("06")?)));
-
-        // Any
-        let matcher = OccurrenceMatcher::new("/*")?;
-        assert!(matcher.is_match(Some(&Occurrence::new("00")?)));
-        assert!(matcher.is_match(Some(&Occurrence::new("01")?)));
-        assert!(matcher.is_match(None));
-
-        // None
-        let matcher = OccurrenceMatcher::None;
-        assert!(matcher.is_match(Some(&Occurrence::new("00")?)));
-        assert!(!matcher.is_match(Some(&Occurrence::new("01")?)));
-        assert!(matcher.is_match(None));
-
-        // Error
-        assert!(OccurrenceMatcher::new("/0A").is_err());
-        assert!(OccurrenceMatcher::new("/05-03").is_err());
-        assert!(OccurrenceMatcher::new("/05-05").is_err());
-        assert!(OccurrenceMatcher::new("/05-0A").is_err());
-        assert!(OccurrenceMatcher::new("/A").is_err());
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_occurrence_matcher_to_string() -> TestResult {
-        assert_eq!(OccurrenceMatcher::new("/01")?.to_string(), "/01");
-        assert_eq!(
-            OccurrenceMatcher::new("/01-04")?.to_string(),
-            "/01-04"
-        );
-        assert_eq!(OccurrenceMatcher::new("/*")?.to_string(), "/*");
-        assert_eq!(OccurrenceMatcher::new("")?.to_string(), "");
-
-        Ok(())
-    }
-
-    #[quickcheck]
-    fn occurrence_matcher_quickcheck1(occurrence: Occurrence) -> bool {
-        OccurrenceMatcher::from(occurrence.clone())
-            .is_match(Some(&occurrence))
-    }
-
-    #[quickcheck]
-    fn occurrence_matcher_quickcheck2(occurrence: Occurrence) -> bool {
-        OccurrenceMatcher::Any.is_match(Some(&occurrence))
-    }
-}
diff --git a/src/matcher/record_matcher.rs b/src/matcher/record_matcher.rs
deleted file mode 100644
index 858a94020..000000000
--- a/src/matcher/record_matcher.rs
+++ /dev/null
@@ -1,507 +0,0 @@
-use std::fmt;
-use std::ops::{BitAnd, BitOr, Not};
-
-use nom::branch::alt;
-use nom::bytes::complete::tag;
-use nom::character::complete::{char, digit1};
-use nom::combinator::{all_consuming, cut, map, map_res, opt};
-use nom::multi::many1;
-use nom::sequence::{preceded, terminated, tuple};
-use nom::Finish;
-
-use super::subfield_matcher::parse_subfield_matcher_exists;
-use crate::common::{ws, ParseResult};
-use crate::matcher::*;
-use crate::{ByteRecord, Error};
-
-#[derive(Debug, PartialEq)]
-pub enum RecordMatcher {
-    Singleton(Box<FieldMatcher>),
-    Group(Box<RecordMatcher>),
-    Not(Box<RecordMatcher>),
-    Composite(Box<RecordMatcher>, BooleanOp, Box<RecordMatcher>),
-    Cardinality(
-        TagMatcher,
-        OccurrenceMatcher,
-        Option<Box<SubfieldListMatcher>>,
-        ComparisonOp,
-        usize,
-    ),
-    True,
-}
-
-impl fmt::Display for RecordMatcher {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Singleton(expr) => expr.fmt(f),
-            Self::Group(expr) => write!(f, "({expr})"),
-            Self::Not(expr) => write!(f, "!{expr}"),
-            Self::Composite(lhs, op, rhs) => {
-                write!(f, "{lhs} {op} {rhs}")
-            }
-            Self::Cardinality(tm, om, sm, op, value) => {
-                if let Some(sm) = sm {
-                    write!(f, "#{tm}{om}{{{sm}}} {op} {value}")
-                } else {
-                    write!(f, "#{tm}{om} {op} {value}")
-                }
-            }
-            Self::True => write!(f, "True"),
-        }
-    }
-}
-
-impl RecordMatcher {
-    /// Creates a record matcher from a string slice.
-    ///
-    /// If an invalid record matcher is given, an error is returned.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::RecordMatcher;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     assert!(RecordMatcher::new(
-    ///         "013A? && 012A/*{0? && 0 == 'abc'}"
-    ///     )
-    ///     .is_ok());
-    ///     assert!(RecordMatcher::new("013!?").is_err());
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn new<S: AsRef<str>>(data: S) -> Result<Self, Error> {
-        let data = data.as_ref();
-
-        match all_consuming(parse_record_matcher)(data.as_bytes())
-            .finish()
-        {
-            Ok((_, matcher)) => Ok(matcher),
-            Err(_) => Err(Error::InvalidMatcher(format!(
-                "Expected valid record matcher, got '{data}'"
-            ))),
-        }
-    }
-
-    /// Returns true, if and only if the given record matches against
-    /// the record matcher.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use std::str::FromStr;
-    ///
-    /// use pica::matcher::{MatcherFlags, RecordMatcher};
-    /// use pica::ByteRecord;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     let matcher = RecordMatcher::new("012A/*{0? && 0 == 'abc'}")?;
-    ///     let record = ByteRecord::from_bytes("012A/01 \x1f0abc\x1e")?;
-    ///     assert!(matcher.is_match(&record, &MatcherFlags::default()));
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn is_match(
-        &self,
-        record: &ByteRecord,
-        flags: &MatcherFlags,
-    ) -> bool {
-        match self {
-            Self::Singleton(matcher) => record
-                .iter()
-                .any(|field| matcher.is_match(field, flags)),
-            Self::Group(matcher) => matcher.is_match(record, flags),
-            Self::Not(matcher) => !matcher.is_match(record, flags),
-            Self::Composite(lhs, BooleanOp::And, rhs) => {
-                lhs.is_match(record, flags)
-                    && rhs.is_match(record, flags)
-            }
-            Self::Composite(lhs, BooleanOp::Or, rhs) => {
-                lhs.is_match(record, flags)
-                    || rhs.is_match(record, flags)
-            }
-            Self::Cardinality(
-                tag,
-                occurrence,
-                subfields,
-                op,
-                value,
-            ) => {
-                let fields = record
-                    .iter()
-                    .filter(|field| {
-                        tag.is_match(field.tag())
-                            && occurrence.is_match(field.occurrence())
-                    })
-                    .filter(|field| {
-                        if let Some(matcher) = subfields {
-                            matcher.is_match(field.subfields(), flags)
-                        } else {
-                            true
-                        }
-                    });
-
-                let cardinality = fields.count();
-
-                match op {
-                    ComparisonOp::Eq => cardinality == *value,
-                    ComparisonOp::Ne => cardinality != *value,
-                    ComparisonOp::Gt => cardinality > *value,
-                    ComparisonOp::Ge => cardinality >= *value,
-                    ComparisonOp::Lt => cardinality < *value,
-                    ComparisonOp::Le => cardinality <= *value,
-                    _ => unreachable!(),
-                }
-            }
-            Self::True => true,
-        }
-    }
-}
-
-impl From<FieldMatcher> for RecordMatcher {
-    fn from(matcher: FieldMatcher) -> Self {
-        RecordMatcher::Singleton(Box::new(matcher))
-    }
-}
-
-impl BitAnd for RecordMatcher {
-    type Output = Self;
-
-    fn bitand(self, rhs: Self) -> Self::Output {
-        RecordMatcher::Composite(
-            Box::new(self),
-            BooleanOp::And,
-            Box::new(rhs),
-        )
-    }
-}
-
-impl BitOr for RecordMatcher {
-    type Output = Self;
-
-    fn bitor(self, rhs: Self) -> Self::Output {
-        RecordMatcher::Composite(
-            Box::new(self),
-            BooleanOp::Or,
-            Box::new(rhs),
-        )
-    }
-}
-
-impl Not for RecordMatcher {
-    type Output = Self;
-
-    fn not(self) -> Self::Output {
-        RecordMatcher::Not(Box::new(self))
-    }
-}
-
-fn parse_record_matcher_singleton(
-    i: &[u8],
-) -> ParseResult<RecordMatcher> {
-    map(ws(parse_field_matcher), |x| {
-        RecordMatcher::Singleton(Box::new(x))
-    })(i)
-}
-
-fn parse_record_matcher_exists(i: &[u8]) -> ParseResult<RecordMatcher> {
-    map(
-        alt((
-            ws(parse_field_matcher_exists),
-            map(
-                tuple((
-                    parse_tag_matcher,
-                    parse_occurrence_matcher,
-                    preceded(
-                        char('.'),
-                        cut(parse_subfield_matcher_exists),
-                    ),
-                )),
-                |(tag, occurrence, subfields)| {
-                    FieldMatcher::Subield(
-                        tag,
-                        occurrence,
-                        SubfieldListMatcher::Singleton(subfields),
-                    )
-                },
-            ),
-        )),
-        |x| RecordMatcher::Singleton(Box::new(x)),
-    )(i)
-}
-
-fn parse_record_matcher_group(i: &[u8]) -> ParseResult<RecordMatcher> {
-    map(
-        preceded(
-            ws(char('(')),
-            cut(terminated(
-                alt((
-                    parse_record_matcher_composite,
-                    parse_record_matcher_singleton,
-                    parse_record_matcher_not,
-                    parse_record_matcher_cardinality,
-                    parse_record_matcher_group,
-                )),
-                ws(char(')')),
-            )),
-        ),
-        |matcher| RecordMatcher::Group(Box::new(matcher)),
-    )(i)
-}
-
-fn parse_record_matcher_not(i: &[u8]) -> ParseResult<RecordMatcher> {
-    map(
-        preceded(
-            ws(char('!')),
-            cut(alt((
-                parse_record_matcher_group,
-                parse_record_matcher_exists,
-                parse_record_matcher_not,
-            ))),
-        ),
-        |matcher| RecordMatcher::Not(Box::new(matcher)),
-    )(i)
-}
-
-fn parse_record_matcher_composite_and(
-    i: &[u8],
-) -> ParseResult<RecordMatcher> {
-    let (i, (first, remainder)) = tuple((
-        alt((
-            ws(parse_record_matcher_group),
-            ws(parse_record_matcher_cardinality),
-            ws(parse_record_matcher_singleton),
-            ws(parse_record_matcher_not),
-            ws(parse_record_matcher_exists),
-        )),
-        many1(preceded(
-            ws(tag("&&")),
-            alt((
-                ws(parse_record_matcher_group),
-                ws(parse_record_matcher_cardinality),
-                ws(parse_record_matcher_singleton),
-                ws(parse_record_matcher_not),
-                ws(parse_record_matcher_exists),
-            )),
-        )),
-    ))(i)?;
-
-    Ok((
-        i,
-        remainder.into_iter().fold(first, |prev, next| prev & next),
-    ))
-}
-
-fn parse_record_matcher_composite_or(
-    i: &[u8],
-) -> ParseResult<RecordMatcher> {
-    let (i, (first, remainder)) = tuple((
-        alt((
-            ws(parse_record_matcher_group),
-            ws(parse_record_matcher_composite_and),
-            ws(parse_record_matcher_cardinality),
-            ws(parse_record_matcher_singleton),
-            ws(parse_record_matcher_not),
-        )),
-        many1(preceded(
-            ws(tag("||")),
-            cut(alt((
-                ws(parse_record_matcher_group),
-                ws(parse_record_matcher_composite_and),
-                ws(parse_record_matcher_cardinality),
-                ws(parse_record_matcher_singleton),
-                ws(parse_record_matcher_not),
-            ))),
-        )),
-    ))(i)?;
-
-    Ok((
-        i,
-        remainder.into_iter().fold(first, |prev, next| prev | next),
-    ))
-}
-
-fn parse_record_matcher_composite(
-    i: &[u8],
-) -> ParseResult<RecordMatcher> {
-    alt((
-        parse_record_matcher_composite_or,
-        parse_record_matcher_composite_and,
-    ))(i)
-}
-
-fn parse_record_matcher_cardinality(
-    i: &[u8],
-) -> ParseResult<RecordMatcher> {
-    map(
-        preceded(
-            ws(char('#')),
-            cut(tuple((
-                ws(parse_tag_matcher),
-                ws(parse_occurrence_matcher),
-                opt(preceded(
-                    ws(char('{')),
-                    cut(terminated(
-                        parse_subfield_list_matcher,
-                        ws(char('}')),
-                    )),
-                )),
-                ws(parse_comparison_op_usize),
-                map_res(digit1, |s| {
-                    std::str::from_utf8(s).unwrap().parse::<usize>()
-                }),
-            ))),
-        ),
-        |(t, o, s, op, value)| {
-            RecordMatcher::Cardinality(t, o, s.map(Box::new), op, value)
-        },
-    )(i)
-}
-
-pub(crate) fn parse_record_matcher(
-    i: &[u8],
-) -> ParseResult<RecordMatcher> {
-    alt((
-        ws(parse_record_matcher_composite),
-        ws(parse_record_matcher_group),
-        ws(parse_record_matcher_not),
-        ws(parse_record_matcher_singleton),
-        ws(parse_record_matcher_cardinality),
-    ))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_record_matcher_invalid() -> TestResult {
-        assert!(RecordMatcher::new("003@ .0 == '123456789X'").is_err());
-        Ok(())
-    }
-
-    #[test]
-    fn test_record_matcher_singleton() -> TestResult {
-        let matcher = RecordMatcher::new("003@.0 == '123456789X'")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        let matcher = RecordMatcher::new("003@.0 == '123456789X'")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f023456789X1\x1e")?;
-        assert!(!matcher.is_match(&record, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_record_matcher_group() -> TestResult {
-        // composite
-        let matcher = RecordMatcher::new(
-            "(#003@ == 1 && 003@.0 == '123456789X')",
-        )?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        // singleton
-        let matcher = RecordMatcher::new("(003@.0 == '123456789X')")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        // not
-        let matcher = RecordMatcher::new("(!012A?)")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        // group
-        let matcher =
-            RecordMatcher::new("(((003@.0 == '123456789X')))")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_record_matcher_not() -> TestResult {
-        // group
-        let matcher = RecordMatcher::new("!(003@.0 == '123456789X')")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0223456789X1\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        // exists
-        let matcher = RecordMatcher::new("!012A?")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        let matcher = RecordMatcher::new("!012A.0?")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        // not
-        let matcher = RecordMatcher::new("!!003@?")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_record_matcher_composite() -> TestResult {
-        let matcher =
-            RecordMatcher::new("003@? && 003@.0 == '123456789X'")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-
-        let matcher =
-            RecordMatcher::new("!012A? && 003@.0 == '123456789X'")?;
-        let record =
-            ByteRecord::from_bytes("003@ \x1f0123456789X\x1e")?;
-        assert!(matcher.is_match(&record, &MatcherFlags::default()));
-        Ok(())
-    }
-
-    #[test]
-    fn test_record_matcher_to_string() -> TestResult {
-        let values = vec![
-            ("003@.0  ==  '0123456789'", "003@.0 == '0123456789'"),
-            ("( 003@.0  ==  '0123456789')", "(003@.0 == '0123456789')"),
-            ("!012A.0?", "!012A.0?"),
-            (
-                "!012A.0? && 013A.a == 'abc'",
-                "!012A.0? && 013A.a == 'abc'",
-            ),
-            (
-                "!012A.0? || 013A.a == 'abc'",
-                "!012A.0? || 013A.a == 'abc'",
-            ),
-            (
-                "#012A{ a? && b == '1'} >= 2",
-                "#012A{a? && b == '1'} >= 2",
-            ),
-            ("#012A >= 2", "#012A >= 2"),
-        ];
-
-        for (matcher, expected) in values {
-            assert_eq!(
-                RecordMatcher::new(matcher)?.to_string(),
-                expected
-            );
-        }
-
-        Ok(())
-    }
-}
diff --git a/src/matcher/subfield_list_matcher.rs b/src/matcher/subfield_list_matcher.rs
deleted file mode 100644
index da50ad721..000000000
--- a/src/matcher/subfield_list_matcher.rs
+++ /dev/null
@@ -1,500 +0,0 @@
-use std::fmt;
-use std::ops::{BitAnd, BitOr};
-
-use nom::branch::alt;
-use nom::bytes::complete::tag;
-use nom::character::complete::{char, digit1};
-use nom::combinator::{all_consuming, cut, map, map_res};
-use nom::multi::many1;
-use nom::sequence::{preceded, terminated, tuple};
-use nom::Finish;
-
-use super::subfield_matcher::parse_subfield_matcher_exists;
-use crate::common::{ws, ParseResult};
-use crate::matcher::{
-    parse_comparison_op_usize, parse_subfield_matcher, BooleanOp,
-    ComparisonOp, MatcherFlags, SubfieldMatcher,
-};
-use crate::subfield::{parse_subfield_code, Subfield};
-use crate::Error;
-
-#[derive(Debug, PartialEq)]
-pub enum SubfieldListMatcher {
-    Singleton(SubfieldMatcher),
-    Group(Box<SubfieldListMatcher>),
-    Not(Box<SubfieldListMatcher>),
-    Composite(
-        Box<SubfieldListMatcher>,
-        BooleanOp,
-        Box<SubfieldListMatcher>,
-    ),
-    Cardinality(char, ComparisonOp, usize),
-}
-
-impl fmt::Display for SubfieldListMatcher {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Singleton(expr) => write!(f, "{expr}"),
-            Self::Group(expr) => write!(f, "({expr})"),
-            Self::Not(expr) => write!(f, "!{expr}"),
-            Self::Composite(lhs, op, rhs) => {
-                write!(f, "{lhs} {op} {rhs}")
-            }
-            Self::Cardinality(code, op, value) => {
-                write!(f, "#{code} {op} {value}")
-            }
-        }
-    }
-}
-
-impl SubfieldListMatcher {
-    /// Creates a subfield list matcher from a string slice.
-    ///
-    /// If an invalid subfield list matcher is given, an error is
-    /// returned.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::SubfieldListMatcher;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     assert!(SubfieldListMatcher::new("0 == 'abc' && 9?").is_ok());
-    ///     assert!(SubfieldListMatcher::new("0 == 'ab' && !?").is_err());
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn new<S: AsRef<str>>(data: S) -> Result<Self, Error> {
-        let data = data.as_ref();
-
-        match all_consuming(parse_subfield_list_matcher)(
-            data.as_bytes(),
-        )
-        .finish()
-        {
-            Ok((_, matcher)) => Ok(matcher),
-            Err(_) => Err(Error::InvalidMatcher(format!(
-                "Expected valid subfield list matcher, got '{data}'"
-            ))),
-        }
-    }
-
-    /// Returns true, if and only if the given subfield list matches
-    /// against the subfield list matcher.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::{MatcherFlags, SubfieldListMatcher};
-    /// use pica::Subfield;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     let matcher = SubfieldListMatcher::new("0 == 'abc' && 9?")?;
-    ///     let list =
-    ///         [Subfield::new('0', "abc")?, Subfield::new('9', "123")?];
-    ///     assert!(matcher.is_match(&list, &MatcherFlags::default()));
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn is_match(
-        &self,
-        subfields: &[Subfield],
-        flags: &MatcherFlags,
-    ) -> bool {
-        match self {
-            Self::Singleton(matcher) => {
-                subfields.iter().any(|s| matcher.is_match(s, flags))
-            }
-            Self::Group(matcher) => matcher.is_match(subfields, flags),
-            Self::Not(matcher) => !matcher.is_match(subfields, flags),
-            Self::Composite(lhs, BooleanOp::And, rhs) => {
-                lhs.is_match(subfields, flags)
-                    && rhs.is_match(subfields, flags)
-            }
-            Self::Composite(lhs, BooleanOp::Or, rhs) => {
-                lhs.is_match(subfields, flags)
-                    || rhs.is_match(subfields, flags)
-            }
-            Self::Cardinality(code, op, value) => {
-                let cardinality = subfields
-                    .iter()
-                    .filter(|s| s.code() == *code)
-                    .count();
-
-                match op {
-                    ComparisonOp::Eq => cardinality == *value,
-                    ComparisonOp::Ne => cardinality != *value,
-                    ComparisonOp::Gt => cardinality > *value,
-                    ComparisonOp::Ge => cardinality >= *value,
-                    ComparisonOp::Lt => cardinality < *value,
-                    ComparisonOp::Le => cardinality <= *value,
-                    _ => unreachable!(),
-                }
-            }
-        }
-    }
-}
-
-impl BitAnd for SubfieldListMatcher {
-    type Output = Self;
-
-    fn bitand(self, rhs: Self) -> Self::Output {
-        SubfieldListMatcher::Composite(
-            Box::new(self),
-            BooleanOp::And,
-            Box::new(rhs),
-        )
-    }
-}
-
-impl BitOr for SubfieldListMatcher {
-    type Output = Self;
-
-    fn bitor(self, rhs: Self) -> Self::Output {
-        SubfieldListMatcher::Composite(
-            Box::new(self),
-            BooleanOp::Or,
-            Box::new(rhs),
-        )
-    }
-}
-
-impl From<SubfieldMatcher> for SubfieldListMatcher {
-    fn from(matcher: SubfieldMatcher) -> Self {
-        SubfieldListMatcher::Singleton(matcher)
-    }
-}
-
-pub(crate) fn parse_subfield_list_matcher_singleton(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    map(ws(parse_subfield_matcher), SubfieldListMatcher::Singleton)(i)
-}
-
-pub(crate) fn parse_subfield_list_matcher_exists(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    map(
-        ws(parse_subfield_matcher_exists),
-        SubfieldListMatcher::Singleton,
-    )(i)
-}
-
-fn parse_subfield_list_matcher_cardinality(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    map(
-        preceded(
-            char('#'),
-            cut(tuple((
-                ws(parse_subfield_code),
-                ws(parse_comparison_op_usize),
-                map_res(digit1, |s| {
-                    std::str::from_utf8(s).unwrap().parse::<usize>()
-                }),
-            ))),
-        ),
-        |(code, op, value)| {
-            SubfieldListMatcher::Cardinality(code, op, value)
-        },
-    )(i)
-}
-
-fn parse_subfield_list_matcher_group(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    map(
-        preceded(
-            ws(char('(')),
-            cut(terminated(
-                alt((
-                    parse_subfield_list_matcher_composite,
-                    parse_subfield_list_matcher_singleton,
-                    parse_subfield_list_matcher_not,
-                    parse_subfield_list_matcher_group,
-                )),
-                ws(char(')')),
-            )),
-        ),
-        |matcher| SubfieldListMatcher::Group(Box::new(matcher)),
-    )(i)
-}
-
-fn parse_subfield_list_matcher_not(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    map(
-        preceded(
-            ws(char('!')),
-            cut(alt((
-                parse_subfield_list_matcher_group,
-                parse_subfield_list_matcher_exists,
-                parse_subfield_list_matcher_not,
-            ))),
-        ),
-        |matcher| SubfieldListMatcher::Not(Box::new(matcher)),
-    )(i)
-}
-
-fn parse_subfield_list_matcher_composite_and(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    let (i, (first, remainder)) = tuple((
-        alt((
-            ws(parse_subfield_list_matcher_group),
-            ws(parse_subfield_list_matcher_singleton),
-            ws(parse_subfield_list_matcher_cardinality),
-            ws(parse_subfield_list_matcher_not),
-        )),
-        many1(preceded(
-            ws(tag("&&")),
-            alt((
-                ws(parse_subfield_list_matcher_group),
-                ws(parse_subfield_list_matcher_singleton),
-                ws(parse_subfield_list_matcher_cardinality),
-                ws(parse_subfield_list_matcher_not),
-            )),
-        )),
-    ))(i)?;
-
-    Ok((
-        i,
-        remainder.into_iter().fold(first, |prev, next| prev & next),
-    ))
-}
-
-fn parse_subfield_list_matcher_composite_or(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    let (i, (first, remainder)) = tuple((
-        alt((
-            ws(parse_subfield_list_matcher_group),
-            ws(parse_subfield_list_matcher_composite_and),
-            ws(parse_subfield_list_matcher_singleton),
-            ws(parse_subfield_list_matcher_cardinality),
-            ws(parse_subfield_list_matcher_not),
-        )),
-        many1(preceded(
-            ws(tag("||")),
-            cut(alt((
-                ws(parse_subfield_list_matcher_group),
-                ws(parse_subfield_list_matcher_composite_and),
-                ws(parse_subfield_list_matcher_singleton),
-                ws(parse_subfield_list_matcher_cardinality),
-                ws(parse_subfield_list_matcher_not),
-            ))),
-        )),
-    ))(i)?;
-
-    Ok((
-        i,
-        remainder.into_iter().fold(first, |prev, next| prev | next),
-    ))
-}
-
-fn parse_subfield_list_matcher_composite(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    alt((
-        parse_subfield_list_matcher_composite_or,
-        parse_subfield_list_matcher_composite_and,
-    ))(i)
-}
-
-pub(crate) fn parse_subfield_list_matcher(
-    i: &[u8],
-) -> ParseResult<SubfieldListMatcher> {
-    alt((
-        parse_subfield_list_matcher_composite,
-        parse_subfield_list_matcher_group,
-        parse_subfield_list_matcher_not,
-        parse_subfield_list_matcher_singleton,
-        parse_subfield_list_matcher_cardinality,
-    ))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_subfield_list_matcher_singleton() -> TestResult {
-        let matcher = SubfieldListMatcher::new("0 == 'abc'")?;
-
-        let subfields = [Subfield::new('0', "abc")?];
-        assert!(matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        let subfields = [Subfield::new('0', "bcd")?];
-        assert!(!matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_list_matcher_cardinality() -> TestResult {
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-
-        let matcher = SubfieldListMatcher::new("#0 == 2")?;
-        assert!(matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        let matcher = SubfieldListMatcher::new("#0 >= 2")?;
-        assert!(matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        let matcher = SubfieldListMatcher::new("#0 <= 2")?;
-        assert!(matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        let matcher = SubfieldListMatcher::new("#0 != 2")?;
-        assert!(!matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        let matcher = SubfieldListMatcher::new("#0 < 2")?;
-        assert!(!matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        let matcher = SubfieldListMatcher::new("#0 > 2")?;
-        assert!(!matcher.is_match(&subfields, &MatcherFlags::default()));
-
-        assert!(SubfieldListMatcher::new("#0 == 'abc'").is_err());
-        assert!(SubfieldListMatcher::new("#0 == -1").is_err());
-        assert!(SubfieldListMatcher::new("##0 == 1").is_err());
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_list_matcher_group() -> TestResult {
-        let flags = MatcherFlags::default();
-
-        let matcher = SubfieldListMatcher::new("(0? && 0 == 'abc')")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new("(0 == 'abc')")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new("(!9?)")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new("((0 == 'def'))")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        assert!(SubfieldListMatcher::new("((0 == 'abc')").is_err());
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_list_matcher_not() -> TestResult {
-        let flags = MatcherFlags::default();
-
-        let matcher = SubfieldListMatcher::new("!(0? && 0 == 'hij')")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new("!9?")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new("!!(0? && 0 == 'abc')")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_list_matcher_composite() -> TestResult {
-        let flags = MatcherFlags::default();
-
-        let matcher =
-            SubfieldListMatcher::new("0? && 0 == 'abc' && 0 == 'def'")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher =
-            SubfieldListMatcher::new("0 == 'abc' && 0 == 'def'")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "hij")?];
-        assert!(!matcher.is_match(&subfields, &flags));
-
-        let matcher =
-            SubfieldListMatcher::new("0 == 'abc' && 0 == 'def'")?;
-        let subfields =
-            [Subfield::new('0', "hij")?, Subfield::new('0', "def")?];
-        assert!(!matcher.is_match(&subfields, &flags));
-
-        let matcher =
-            SubfieldListMatcher::new("0 == 'abc' || 0 == 'def'")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "hij")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher =
-            SubfieldListMatcher::new("0 == 'abc' || 0 == 'def'")?;
-        let subfields =
-            [Subfield::new('0', "hij")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher =
-            SubfieldListMatcher::new("9? || 0 == 'abc' && 0 == 'def'")?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new(
-            "9? && 0 == 'abc' ||  0 == 'def'",
-        )?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(matcher.is_match(&subfields, &flags));
-
-        let matcher = SubfieldListMatcher::new(
-            "9? && 0 == 'abc' ||  0 == 'hij'",
-        )?;
-        let subfields =
-            [Subfield::new('0', "abc")?, Subfield::new('0', "def")?];
-        assert!(!matcher.is_match(&subfields, &flags));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_list_matcher_to_string() -> TestResult {
-        let values = vec![
-            ("0 == 'abc'", "0 == 'abc'"),
-            ("( a == 'abc' )", "(a == 'abc')"),
-            ("!( a == 'abc' )", "!(a == 'abc')"),
-            (
-                "a == 'a'  && b == 'b'  && c == 'c' ",
-                "a == 'a' && b == 'b' && c == 'c'",
-            ),
-            (
-                "a == 'a'  || b == 'b'  || c == 'c' ",
-                "a == 'a' || b == 'b' || c == 'c'",
-            ),
-            ("#a  >=  3", "#a >= 3"),
-        ];
-
-        for (matcher, expected) in values {
-            assert_eq!(
-                SubfieldListMatcher::new(matcher)?.to_string(),
-                expected
-            );
-        }
-
-        Ok(())
-    }
-}
diff --git a/src/matcher/subfield_matcher.rs b/src/matcher/subfield_matcher.rs
deleted file mode 100644
index 9b6fa3036..000000000
--- a/src/matcher/subfield_matcher.rs
+++ /dev/null
@@ -1,583 +0,0 @@
-use std::fmt;
-
-use bstr::{BString, ByteSlice};
-use nom::branch::alt;
-use nom::bytes::complete::tag;
-use nom::character::complete::char;
-use nom::combinator::{all_consuming, cut, map, opt, value, verify};
-use nom::multi::{many1, separated_list1};
-use nom::sequence::{preceded, terminated, tuple};
-use nom::Finish;
-use regex::bytes::RegexBuilder;
-use regex::Regex;
-use strsim::normalized_levenshtein;
-
-use crate::common::{parse_string, ws, ParseResult};
-use crate::matcher::{
-    parse_comparison_op_bstring, ComparisonOp, MatcherFlags,
-};
-use crate::subfield::parse_subfield_code;
-use crate::{Error, Subfield};
-
-macro_rules! maybe_lowercase {
-    ($value:expr, $flag:expr) => {
-        if $flag {
-            $value.to_lowercase()
-        } else {
-            $value
-        }
-    };
-}
-
-/// A subfield matcher.
-#[derive(Debug, PartialEq, Eq)]
-pub enum SubfieldMatcher {
-    Comparison(Vec<char>, ComparisonOp, BString),
-    Exists(Vec<char>),
-    In(Vec<char>, Vec<BString>, bool),
-    Regex(Vec<char>, String, bool),
-}
-
-fn fmt_codes(codes: &Vec<char>) -> String {
-    let result = String::from_iter(codes);
-    if result.len() > 1 {
-        format!("[{result}]")
-    } else {
-        result
-    }
-}
-
-impl fmt::Display for SubfieldMatcher {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Comparison(codes, op, value) => {
-                write!(f, "{} {op} '{value}'", fmt_codes(codes))
-            }
-            Self::Exists(codes) => write!(f, "{}?", fmt_codes(codes)),
-            Self::In(codes, values, invert) => {
-                let values: String = values
-                    .iter()
-                    .map(|s| format!("'{s}'"))
-                    .collect::<Vec<String>>()
-                    .join(", ");
-
-                if *invert {
-                    write!(f, "{} not in [{values}]", fmt_codes(codes))
-                } else {
-                    write!(f, "{} in [{values}]", fmt_codes(codes))
-                }
-            }
-            Self::Regex(codes, regex, invert) => {
-                if *invert {
-                    write!(f, "{} !~ '{regex}'", fmt_codes(codes))
-                } else {
-                    write!(f, "{} =~ '{regex}'", fmt_codes(codes))
-                }
-            }
-        }
-    }
-}
-
-impl SubfieldMatcher {
-    /// Creates a subfield matcher from a string slice.
-    ///
-    /// If an invalid subfield matcher is given, an error is returned.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::SubfieldMatcher;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     assert!(SubfieldMatcher::new("0 == 'abc'").is_ok());
-    ///     assert!(SubfieldMatcher::new("! == 'ac'").is_err());
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn new<S: AsRef<str>>(data: S) -> Result<Self, Error> {
-        let data = data.as_ref();
-
-        match all_consuming(parse_subfield_matcher)(data.as_bytes())
-            .finish()
-        {
-            Ok((_, matcher)) => Ok(matcher),
-            Err(_) => Err(Error::InvalidMatcher(format!(
-                "Expected valid subfield matcher, got '{data}'"
-            ))),
-        }
-    }
-
-    /// Returns true, if and only if the given subfield matches against
-    /// the subfield matcher.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::{MatcherFlags, SubfieldMatcher};
-    /// use pica::Subfield;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     let matcher = SubfieldMatcher::new("0 == 'abc'")?;
-    ///     let subfield = Subfield::new('0', "abc")?;
-    ///
-    ///     assert!(matcher.is_match(&subfield, &MatcherFlags::new()));
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn is_match(
-        &self,
-        subfield: &Subfield,
-        flags: &MatcherFlags,
-    ) -> bool {
-        let case_cmp = |lhs: &BString, rhs: &BString| -> bool {
-            if flags.ignore_case {
-                lhs.to_lowercase() == rhs.to_lowercase()
-            } else {
-                lhs == rhs
-            }
-        };
-
-        match self {
-            Self::Comparison(codes, ComparisonOp::Eq, value) => {
-                codes.contains(&subfield.code())
-                    && case_cmp(subfield.value(), value)
-            }
-            Self::Comparison(codes, ComparisonOp::Ne, value) => {
-                codes.contains(&subfield.code())
-                    && !case_cmp(subfield.value(), value)
-            }
-            Self::Comparison(
-                codes,
-                ComparisonOp::StartsWith,
-                value,
-            ) => {
-                codes.contains(&subfield.code())
-                    && if flags.ignore_case {
-                        subfield
-                            .value()
-                            .to_lowercase()
-                            .starts_with(&value.to_lowercase())
-                    } else {
-                        subfield.value().starts_with(value)
-                    }
-            }
-            Self::Comparison(codes, ComparisonOp::EndsWith, value) => {
-                codes.contains(&subfield.code())
-                    && if flags.ignore_case {
-                        subfield
-                            .value()
-                            .to_lowercase()
-                            .ends_with(&value.to_lowercase())
-                    } else {
-                        subfield.value().ends_with(value)
-                    }
-            }
-            Self::Comparison(codes, ComparisonOp::Similar, value) => {
-                if codes.contains(&subfield.code()) {
-                    let flag = flags.ignore_case;
-                    let lhs = maybe_lowercase!(
-                        subfield.value().to_vec(),
-                        flag
-                    );
-                    let rhs = maybe_lowercase!(value.to_vec(), flag);
-
-                    let score = normalized_levenshtein(
-                        &lhs.to_str_lossy(),
-                        &rhs.to_str_lossy(),
-                    );
-
-                    score > flags.strsim_threshold
-                } else {
-                    false
-                }
-            }
-            Self::Comparison(_, _, _) => unreachable!(),
-            Self::Regex(codes, regex, invert) => {
-                if codes.contains(&subfield.code()) {
-                    let re = RegexBuilder::new(regex)
-                        .case_insensitive(flags.ignore_case)
-                        .build()
-                        .unwrap();
-
-                    let mut result = re.is_match(subfield.value());
-                    if *invert {
-                        result = !result;
-                    }
-
-                    result
-                } else {
-                    false
-                }
-            }
-            Self::In(codes, values, invert) => {
-                if !codes.contains(&subfield.code()) {
-                    false
-                } else {
-                    let mut result =
-                        values.iter().any(|x: &BString| {
-                            case_cmp(subfield.value(), x)
-                        });
-
-                    if *invert {
-                        result = !result;
-                    }
-
-                    result
-                }
-            }
-            Self::Exists(codes) => codes.contains(&subfield.code()),
-        }
-    }
-}
-
-fn parse_subfield_codes(i: &[u8]) -> ParseResult<Vec<char>> {
-    alt((
-        preceded(
-            char('['),
-            cut(terminated(many1(parse_subfield_code), char(']'))),
-        ),
-        map(char('*'), |_| {
-            "0123456789abcdefghijklmnopqrstuvwxyz"
-                .chars()
-                .collect::<Vec<char>>()
-        }),
-        many1(parse_subfield_code),
-        map(parse_subfield_code, |x| vec![x]),
-    ))(i)
-}
-
-fn parse_subfield_matcher_comparison(
-    i: &[u8],
-) -> ParseResult<SubfieldMatcher> {
-    map(
-        tuple((
-            ws(parse_subfield_codes),
-            ws(parse_comparison_op_bstring),
-            ws(parse_string),
-        )),
-        |(codes, op, value)| {
-            SubfieldMatcher::Comparison(codes, op, BString::from(value))
-        },
-    )(i)
-}
-
-fn parse_subfield_matcher_regex(
-    i: &[u8],
-) -> ParseResult<SubfieldMatcher> {
-    map(
-        tuple((
-            parse_subfield_codes,
-            alt((
-                value(false, ws(tag("=~"))),
-                value(true, ws(tag("!~"))),
-            )),
-            verify(parse_string, |x| Regex::new(x).is_ok()),
-        )),
-        |(codes, invert, regex)| {
-            SubfieldMatcher::Regex(codes, regex, invert)
-        },
-    )(i)
-}
-
-fn parse_subfield_matcher_in(i: &[u8]) -> ParseResult<SubfieldMatcher> {
-    map(
-        tuple((
-            parse_subfield_codes,
-            opt(ws(tag("not"))),
-            ws(tag("in")),
-            preceded(
-                ws(char('[')),
-                cut(terminated(
-                    separated_list1(
-                        ws(char(',')),
-                        map(parse_string, BString::from),
-                    ),
-                    ws(char(']')),
-                )),
-            ),
-        )),
-        |(codes, invert, _, values)| {
-            SubfieldMatcher::In(codes, values, invert.is_some())
-        },
-    )(i)
-}
-
-pub(crate) fn parse_subfield_matcher_exists(
-    i: &[u8],
-) -> ParseResult<SubfieldMatcher> {
-    map(
-        terminated(ws(parse_subfield_codes), char('?')),
-        SubfieldMatcher::Exists,
-    )(i)
-}
-
-pub(crate) fn parse_subfield_matcher(
-    i: &[u8],
-) -> ParseResult<SubfieldMatcher> {
-    alt((
-        ws(parse_subfield_matcher_comparison),
-        ws(parse_subfield_matcher_regex),
-        ws(parse_subfield_matcher_in),
-        ws(parse_subfield_matcher_exists),
-    ))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_parse_subfield_codes() -> TestResult {
-        assert_eq!(
-            parse_subfield_codes(b"[abc]")?.1,
-            vec!['a', 'b', 'c']
-        );
-        assert_eq!(
-            parse_subfield_codes(b"abc")?.1,
-            vec!['a', 'b', 'c']
-        );
-        assert_eq!(parse_subfield_codes(b"a")?.1, vec!['a']);
-        Ok(())
-    }
-
-    #[test]
-    fn test_parse_subfield_matcher() -> TestResult {
-        assert!(parse_subfield_matcher(b"[a0] == 'abc'").is_ok());
-        assert!(parse_subfield_matcher(b"[a0] != 'abc'").is_ok());
-        assert!(parse_subfield_matcher(b"[a0] =$ 'abc'").is_ok());
-        assert!(parse_subfield_matcher(b"[a0] =^ 'abc'").is_ok());
-        assert!(parse_subfield_matcher(b"[a0] =~ '^abc'").is_ok());
-        assert!(parse_subfield_matcher(b"[a0] !~ '^abc'").is_ok());
-        assert!(parse_subfield_matcher(b"[a0] in ['a', 'b']").is_ok());
-        assert!(
-            parse_subfield_matcher(b"[a0] not in ['a', 'b']").is_ok()
-        );
-        assert!(parse_subfield_matcher(b"[a0]?").is_ok());
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_invalid() -> TestResult {
-        assert!(SubfieldMatcher::new("[aä] == 'abc'").is_err());
-        assert!(SubfieldMatcher::new("! == 'abc'").is_err());
-        assert!(SubfieldMatcher::new("! == 'abc").is_err());
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_eq() -> TestResult {
-        let flags = MatcherFlags::new();
-
-        let matcher = SubfieldMatcher::new("0 == 'abc'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("[01] == 'abc'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('1', "abc")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('2', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 == 'def'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 == 'ABC'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 == 'ABC'")?;
-        assert!(matcher.is_match(
-            &Subfield::new('0', "abc")?,
-            &flags.ignore_case(true)
-        ));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_ne() -> TestResult {
-        let flags = MatcherFlags::new();
-
-        let matcher = SubfieldMatcher::new("0 != 'abc'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "def")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('1', "def")?, &flags));
-
-        let matcher = SubfieldMatcher::new("[01] != 'abc'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "def")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('1', "def")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 != 'abc'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 != 'ABC'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 != 'ABC'")?;
-        assert!(!matcher.is_match(
-            &Subfield::new('0', "abc")?,
-            &flags.ignore_case(true)
-        ));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_starts_with() -> TestResult {
-        let flags = MatcherFlags::new();
-
-        let matcher = SubfieldMatcher::new("0 =^ 'ab'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("[01] =^ 'ab'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('1', "abc")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('2', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =^ 'ab'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "bcd")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =^ 'AB'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =^ 'AB'")?;
-        assert!(matcher.is_match(
-            &Subfield::new('0', "abc")?,
-            &flags.ignore_case(true)
-        ));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_ends_with() -> TestResult {
-        let flags = MatcherFlags::new();
-
-        let matcher = SubfieldMatcher::new("0 =$ 'bc'")?;
-        assert!(matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =$ 'bc'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "bcd")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =$ 'BC'")?;
-        assert!(!matcher.is_match(&Subfield::new('0', "abc")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =$ 'BC'")?;
-        assert!(matcher.is_match(
-            &Subfield::new('0', "abc")?,
-            &flags.ignore_case(true)
-        ));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_similar() -> TestResult {
-        let matcher = SubfieldMatcher::new("0 =* 'Heike'")?;
-        let flags = MatcherFlags::new();
-        assert!(matcher.is_match(&Subfield::new('0', "Heike")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =* 'Heike'")?;
-        let flags = MatcherFlags::new();
-        assert!(
-            !matcher.is_match(&Subfield::new('0', "Heiko")?, &flags)
-        );
-
-        let matcher = SubfieldMatcher::new("0 =* 'Heike'")?;
-        let flags = MatcherFlags::new().strsim_threshold(0.7);
-        assert!(matcher.is_match(&Subfield::new('0', "Heiko")?, &flags));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_regex() -> TestResult {
-        let matcher = SubfieldMatcher::new("0 =~ '^A.*C$'")?;
-        let flags = MatcherFlags::new();
-        assert!(matcher.is_match(&Subfield::new('0', "AbC")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =~ '^A.*C$'")?;
-        let flags = MatcherFlags::new();
-        assert!(!matcher.is_match(&Subfield::new('0', "abC")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 =~ '^A.*C$'")?;
-        let flags = MatcherFlags::new().ignore_case(true);
-        assert!(matcher.is_match(&Subfield::new('0', "abC")?, &flags));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_in() -> TestResult {
-        let matcher = SubfieldMatcher::new("0 in ['a', 'b', 'c']")?;
-        let flags = MatcherFlags::new();
-
-        assert!(matcher.is_match(&Subfield::new('0', "a")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('0', "b")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('0', "c")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('0', "A")?, &flags));
-
-        let matcher = SubfieldMatcher::new("[01] in ['a', 'b']")?;
-        let flags = MatcherFlags::new();
-
-        assert!(matcher.is_match(&Subfield::new('0', "a")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('0', "b")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('1', "a")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('1', "b")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('2', "a")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 not in ['a', 'b', 'c']")?;
-        let flags = MatcherFlags::new();
-
-        assert!(!matcher.is_match(&Subfield::new('0', "a")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('0', "b")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('0', "c")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('0', "A")?, &flags));
-
-        let matcher = SubfieldMatcher::new("0 in ['a', 'b', 'c']")?;
-        let flags = MatcherFlags::new().ignore_case(true);
-        assert!(matcher.is_match(&Subfield::new('0', "A")?, &flags));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_exists() -> TestResult {
-        let matcher = SubfieldMatcher::new("0?")?;
-        let flags = MatcherFlags::new();
-
-        assert!(matcher.is_match(&Subfield::new('0', "a")?, &flags));
-        assert!(!matcher.is_match(&Subfield::new('1', "a")?, &flags));
-
-        let matcher = SubfieldMatcher::new("[01]?")?;
-        let flags = MatcherFlags::new();
-
-        assert!(matcher.is_match(&Subfield::new('0', "a")?, &flags));
-        assert!(matcher.is_match(&Subfield::new('1', "a")?, &flags));
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_subfield_matcher_to_string() -> TestResult {
-        let matchers = vec![
-            ("0  == 'abc' ", "0 == 'abc'"),
-            ("[01]  == 'abc' ", "[01] == 'abc'"),
-            ("0? ", "0?"),
-            ("[23]? ", "[23]?"),
-            ("[2]? ", "2?"),
-            ("0 in [ 'a', 'b' ]", "0 in ['a', 'b']"),
-            ("[03] in [ 'a', 'b' ]", "[03] in ['a', 'b']"),
-            ("0 =~ '^O[^bc]'", "0 =~ '^O[^bc]'"),
-            ("[45] =~ '^O[^bc]'", "[45] =~ '^O[^bc]'"),
-        ];
-
-        for (matcher, expected) in matchers {
-            assert_eq!(
-                SubfieldMatcher::new(matcher)?.to_string(),
-                expected
-            );
-        }
-
-        Ok(())
-    }
-}
diff --git a/src/matcher/tag_matcher.rs b/src/matcher/tag_matcher.rs
deleted file mode 100644
index 81f2e6b5c..000000000
--- a/src/matcher/tag_matcher.rs
+++ /dev/null
@@ -1,239 +0,0 @@
-use std::fmt;
-use std::ops::RangeFrom;
-
-use nom::branch::alt;
-use nom::character::complete::{char, one_of};
-use nom::combinator::{all_consuming, cut, map, value};
-use nom::error::ParseError;
-use nom::multi::many1;
-use nom::sequence::{preceded, terminated, tuple};
-use nom::{
-    AsChar, FindToken, Finish, IResult, InputIter, InputLength, Slice,
-};
-
-use crate::common::ParseResult;
-use crate::tag::{parse_tag, Tag};
-use crate::Error;
-
-#[derive(Debug, PartialEq, Eq)]
-pub enum TagMatcher {
-    Some(Tag),
-    Pattern(Vec<char>, Vec<char>, Vec<char>, Vec<char>),
-}
-
-impl fmt::Display for TagMatcher {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Some(tag) => write!(f, "{tag}"),
-            Self::Pattern(ref p1, ref p2, ref p3, ref p4) => {
-                let fmt_p = |p: &Vec<char>| -> String {
-                    if p.len() > 1 {
-                        format!("[{}]", String::from_iter(p))
-                    } else {
-                        String::from_iter(p)
-                    }
-                };
-
-                write!(
-                    f,
-                    "{}{}{}{}",
-                    fmt_p(p1),
-                    fmt_p(p2),
-                    fmt_p(p3),
-                    fmt_p(p4)
-                )
-            }
-        }
-    }
-}
-
-impl TagMatcher {
-    /// Creates a tag matcher from a string slice.
-    ///
-    /// If an invalid tag matcher is given, an error is returned.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::TagMatcher;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     assert!(TagMatcher::new("003@").is_ok());
-    ///     assert!(TagMatcher::new("0[12]3A").is_ok());
-    ///     assert!(TagMatcher::new("023!").is_err());
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn new<S: AsRef<str>>(data: S) -> Result<Self, Error> {
-        let data = data.as_ref();
-
-        match all_consuming(parse_tag_matcher)(data.as_bytes()).finish()
-        {
-            Ok((_, matcher)) => Ok(matcher),
-            Err(_) => Err(Error::InvalidMatcher(format!(
-                "Expected valid tag matcher, got '{data}'"
-            ))),
-        }
-    }
-
-    /// Returns true, if and only if the given tag matches against the
-    /// tag matcher.
-    ///
-    /// # Example
-    ///
-    /// ```rust
-    /// use pica::matcher::TagMatcher;
-    /// use pica::Tag;
-    ///
-    /// # fn main() { example().unwrap(); }
-    /// fn example() -> Result<(), Box<dyn std::error::Error>> {
-    ///     let matcher = TagMatcher::new("012[A@]")?;
-    ///     assert!(matcher.is_match(&Tag::new("012A")?));
-    ///     assert!(matcher.is_match(&Tag::new("012@")?));
-    ///     Ok(())
-    /// }
-    /// ```
-    pub fn is_match(&self, tag: &Tag) -> bool {
-        match self {
-            TagMatcher::Some(lhs) => lhs == tag,
-            TagMatcher::Pattern(p0, p1, p2, p3) => {
-                p0.contains(&(tag[0] as char))
-                    && p1.contains(&(tag[1] as char))
-                    && p2.contains(&(tag[2] as char))
-                    && p3.contains(&(tag[3] as char))
-            }
-        }
-    }
-}
-
-impl From<Tag> for TagMatcher {
-    fn from(tag: Tag) -> Self {
-        Self::Some(tag)
-    }
-}
-
-fn parse_character_class<I, T, E: ParseError<I>>(
-    list: T,
-) -> impl FnMut(I) -> IResult<I, Vec<char>, E>
-where
-    I: Slice<RangeFrom<usize>> + InputIter + Clone + InputLength,
-    <I as InputIter>::Item: AsChar + Copy,
-    T: FindToken<<I as InputIter>::Item> + Clone,
-{
-    alt((
-        preceded(
-            char('['),
-            cut(terminated(many1(one_of(list.clone())), char(']'))),
-        ),
-        map(one_of(list), |x| vec![x]),
-    ))
-}
-
-pub(crate) fn parse_tag_matcher(i: &[u8]) -> ParseResult<TagMatcher> {
-    alt((
-        map(parse_tag, TagMatcher::Some),
-        map(
-            tuple((
-                alt((
-                    value("012".chars().collect(), char('.')),
-                    parse_character_class("012"),
-                )),
-                alt((
-                    value("0123456789".chars().collect(), char('.')),
-                    parse_character_class("0123456789"),
-                )),
-                alt((
-                    value("0123456789".chars().collect(), char('.')),
-                    parse_character_class("0123456789"),
-                )),
-                alt((
-                    value(
-                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ@".chars().collect(),
-                        char('.'),
-                    ),
-                    parse_character_class(
-                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ@",
-                    ),
-                )),
-            )),
-            |(p1, p2, p3, p4)| TagMatcher::Pattern(p1, p2, p3, p4),
-        ),
-    ))(i)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::test::TestResult;
-
-    #[test]
-    fn test_tag_matcher() -> TestResult {
-        let matcher = TagMatcher::new("012A")?;
-        assert!(matcher.is_match(&Tag::new("012A")?));
-        assert!(!matcher.is_match(&Tag::new("012@")?));
-
-        let matcher = TagMatcher::new("[01][34][56][AB]")?;
-        assert!(matcher.is_match(&Tag::new("035A")?));
-        assert!(matcher.is_match(&Tag::new("146B")?));
-
-        let matcher = TagMatcher::new(".12A")?;
-        assert!(matcher.is_match(&Tag::new("012A")?));
-        assert!(matcher.is_match(&Tag::new("112A")?));
-        assert!(matcher.is_match(&Tag::new("212A")?));
-
-        let matcher = TagMatcher::new("0.2A")?;
-        assert!(matcher.is_match(&Tag::new("002A")?));
-        assert!(matcher.is_match(&Tag::new("012A")?));
-        assert!(matcher.is_match(&Tag::new("022A")?));
-        assert!(matcher.is_match(&Tag::new("032A")?));
-        assert!(matcher.is_match(&Tag::new("042A")?));
-        assert!(matcher.is_match(&Tag::new("052A")?));
-        assert!(matcher.is_match(&Tag::new("062A")?));
-        assert!(matcher.is_match(&Tag::new("072A")?));
-        assert!(matcher.is_match(&Tag::new("082A")?));
-        assert!(matcher.is_match(&Tag::new("092A")?));
-
-        let matcher = TagMatcher::new("01.A")?;
-        assert!(matcher.is_match(&Tag::new("010A")?));
-        assert!(matcher.is_match(&Tag::new("011A")?));
-        assert!(matcher.is_match(&Tag::new("012A")?));
-        assert!(matcher.is_match(&Tag::new("013A")?));
-        assert!(matcher.is_match(&Tag::new("014A")?));
-        assert!(matcher.is_match(&Tag::new("015A")?));
-        assert!(matcher.is_match(&Tag::new("016A")?));
-        assert!(matcher.is_match(&Tag::new("017A")?));
-        assert!(matcher.is_match(&Tag::new("018A")?));
-        assert!(matcher.is_match(&Tag::new("019A")?));
-
-        let matcher = TagMatcher::new("012.")?;
-        assert!(matcher.is_match(&Tag::new("012A")?));
-        assert!(matcher.is_match(&Tag::new("012B")?));
-        assert!(matcher.is_match(&Tag::new("012C")?));
-        assert!(matcher.is_match(&Tag::new("012@")?));
-
-        let matcher = TagMatcher::new("0...")?;
-        assert!(matcher.is_match(&Tag::new("012A")?));
-        assert!(matcher.is_match(&Tag::new("023B")?));
-
-        assert!(TagMatcher::new("412A").is_err());
-        assert!(TagMatcher::new("0A2A").is_err());
-        assert!(TagMatcher::new("01AA").is_err());
-        assert!(TagMatcher::new("0123").is_err());
-
-        Ok(())
-    }
-
-    #[test]
-    fn test_tag_matcher_to_string() -> TestResult {
-        assert_eq!(TagMatcher::new("012A")?.to_string(), "012A");
-        assert_eq!(TagMatcher::new("[01]12A")?.to_string(), "[01]12A");
-        assert_eq!(TagMatcher::new("[0]12A")?.to_string(), "012A");
-        Ok(())
-    }
-
-    #[quickcheck]
-    fn tag_matcher_quickcheck(tag: Tag) -> bool {
-        TagMatcher::from(tag.clone()).is_match(&tag)
-    }
-}