diff --git a/composer.json b/composer.json
index 82a94dc..d19ead3 100755
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         }
     ],
     "require": {
-        "php": "^7.4||^8.01",
+        "php": "^7.4||^8.0",
         "doctrine/annotations": "^1.13",
         "psr/simple-cache": "^1.0",
         "symfony/cache": "^5.4",
diff --git a/src/Finder/ComposerClassFinder.php b/src/Finder/ComposerClassFinder.php
index fd52511..87dc759 100644
--- a/src/Finder/ComposerClassFinder.php
+++ b/src/Finder/ComposerClassFinder.php
@@ -8,8 +8,14 @@
 
 class ComposerClassFinder implements ClassFinder
 {
+    use ExcludeTrait;
+
     public function getClassesNames(string $basePath): array
     {
-        return array_keys(ClassMapGenerator::createMap($basePath));
+        $map = $this->excludeRegex
+            ? ClassMapGenerator::createMap($basePath, $this->excludeRegex)
+            : ClassMapGenerator::createMap($basePath);
+
+        return array_keys($map);
     }
 }
diff --git a/src/Finder/DirectoryIteratorClassFinder.php b/src/Finder/DirectoryIteratorClassFinder.php
index 7bd9785..a48bc93 100644
--- a/src/Finder/DirectoryIteratorClassFinder.php
+++ b/src/Finder/DirectoryIteratorClassFinder.php
@@ -10,7 +10,7 @@
 
 class DirectoryIteratorClassFinder implements ClassFinder
 {
-    private ?string $excludeRegex = null;
+    use ExcludeTrait;
 
     public function getClassesNames(string $basePath): array
     {
@@ -36,11 +36,6 @@ public function getClassesNames(string $basePath): array
         return $classesNames;
     }
 
-    public function setExcludeRegex(string $regex): void
-    {
-        $this->excludeRegex = $regex;
-    }
-
     private function getClassNameFromFile(string $fileName): ?string
     {
         return ClassNameFromPathGenerator::getFullClassNameFromFile($fileName);
diff --git a/src/Finder/ExcludeTrait.php b/src/Finder/ExcludeTrait.php
new file mode 100644
index 0000000..1c09513
--- /dev/null
+++ b/src/Finder/ExcludeTrait.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AnnotationsScanner\Finder;
+
+trait ExcludeTrait
+{
+    private ?string $excludeRegex = null;
+
+    public function setExcludeRegex(string $regex): void
+    {
+        $this->excludeRegex = $regex;
+    }
+}
diff --git a/src/Scanner/AbstractAnnotationScanner.php b/src/Scanner/AbstractAnnotationScanner.php
index f92d321..a84666c 100644
--- a/src/Scanner/AbstractAnnotationScanner.php
+++ b/src/Scanner/AbstractAnnotationScanner.php
@@ -24,6 +24,12 @@ protected function getClassFinder(string $scanMethod): ClassFinder
             return $scanner;
         }
 
-        return new ComposerClassFinder();
+        $scanner = new ComposerClassFinder();
+
+        if ($this->excludeDirectoriesRegex) {
+            $scanner->setExcludeRegex($this->excludeDirectoriesRegex);
+        }
+
+        return $scanner;
     }
 }
diff --git a/src/Scanner/ExcludeDirsNotAvailableException.php b/src/Scanner/ExcludeDirsNotAvailableException.php
deleted file mode 100644
index 95f5823..0000000
--- a/src/Scanner/ExcludeDirsNotAvailableException.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace AnnotationsScanner\Scanner;
-
-use RuntimeException;
-
-class ExcludeDirsNotAvailableException extends RuntimeException
-{
-}
diff --git a/src/Scanner/ScannerBuilder.php b/src/Scanner/ScannerBuilder.php
index 14eba43..c37375a 100644
--- a/src/Scanner/ScannerBuilder.php
+++ b/src/Scanner/ScannerBuilder.php
@@ -66,10 +66,6 @@ public function build(): AnnotationScanner
             throw BasePathMustBeSetException::create();
         }
 
-        if ($this->excludeDirsRegex && $this->scanMethod == ScanMethod::COMPOSER) {
-            throw new ExcludeDirsNotAvailableException('Exclude function available only when directory scan method is in use');
-        }
-
         $collection = new AnnotationsToSearchCollection(new ArrayIterator($this->annotationsToSearchFor));
 
         if ($this->reader) {