Regex should be a raw string
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 6ef114e..a65fe5b 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -210,7 +210,7 @@
>>> # Find the ten most common words in Hamlet
>>> import re
- >>> words = re.findall('\w+', open('hamlet.txt').read().lower())
+ >>> words = re.findall(r'\w+', open('hamlet.txt').read().lower())
>>> Counter(words).most_common(10)
[('the', 1143), ('and', 966), ('to', 762), ('of', 669), ('i', 631),
('you', 554), ('a', 546), ('my', 514), ('hamlet', 471), ('in', 451)]