Index: mox3/tests/test_mox.py
--- mox3/tests/test_mox.py.orig
+++ mox3/tests/test_mox.py
@@ -316,12 +316,12 @@ class RegexTest(testtools.TestCase):
     def testReprWithoutFlags(self):
         """repr should return the regular expression pattern."""
         self.assertTrue(
-            repr(mox.Regex(r"a\s+b")) == "<regular expression 'a\s+b'>")
+            repr(mox.Regex(r"a\s+b")) == r"<regular expression 'a\s+b'>")
 
     def testReprWithFlags(self):
         """repr should return the regular expression pattern and flags."""
         self.assertTrue(repr(mox.Regex(r"a\s+b", flags=2)) ==
-                        "<regular expression 'a\s+b', flags=2>")
+                        r"<regular expression 'a\s+b', flags=2>")
 
 
 class IsTest(testtools.TestCase):
