From 2f959d41ab020772c9555076f030971388059e49 Mon Sep 17 00:00:00 2001
From: Karthikeyan Singaravelan <tir.karthi@gmail.com>
Date: Mon, 1 Jun 2020 22:58:31 +0530
Subject: [PATCH] Fix deprecation warnings due to invalid escape sequences.
 (#489)

---
 petl/util/base.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/petl/util/base.py b/petl/util/base.py
index 65d59c03..22d7acf7 100644
--- a/petl/util/base.py
+++ b/petl/util/base.py
@@ -659,7 +659,7 @@ def expr(s):
 
     """
 
-    prog = re.compile('\{([^}]+)\}')
+    prog = re.compile(r'\{([^}]+)\}')
 
     def repl(matchobj):
         return "rec['%s']" % matchobj.group(1)