diff -r 6d5336a193cc Lib/unittest/case.py
--- a/Lib/unittest/case.py	Sun Apr 12 13:52:49 2015 +0300
+++ b/Lib/unittest/case.py	Mon Apr 13 12:21:33 2015 -0400
@@ -1264,8 +1264,10 @@
             assert expected_regex, "expected_regex must not be empty."
             expected_regex = re.compile(expected_regex)
         if not expected_regex.search(text):
-            msg = msg or "Regex didn't match"
-            msg = '%s: %r not found in %r' % (msg, expected_regex.pattern, text)
+            standardMsg = "Regex didn't match: %r not found in %r" % (
+                expected_regex.pattern, text)
+            # _formatMessage ensures the longMessage option is respected
+            msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)

     def assertNotRegex(self, text, unexpected_regex, msg=None):
@@ -1274,11 +1276,12 @@
             unexpected_regex = re.compile(unexpected_regex)
         match = unexpected_regex.search(text)
         if match:
-            msg = msg or "Regex matched"
-            msg = '%s: %r matches %r in %r' % (msg,
-                                               text[match.start():match.end()],
-                                               unexpected_regex.pattern,
-                                               text)
+            standardMsg = 'Regex matched: %r matches %r in %r' % (
+                text[match.start() : match.end()],
+                unexpected_regex.pattern,
+                text)
+            # _formatMessage ensures the longMessage option is respected
+            msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)


@@ -1300,6 +1303,7 @@
     failIf = _deprecate(assertFalse)
     assertRaisesRegexp = _deprecate(assertRaisesRegex)
     assertRegexpMatches = _deprecate(assertRegex)
+    assertNotRegexpMatches = _deprecate(assertNotRegex)



diff -r 6d5336a193cc Lib/unittest/test/test_assertions.py
--- a/Lib/unittest/test/test_assertions.py	Sun Apr 12 13:52:49 2015 +0300
+++ b/Lib/unittest/test/test_assertions.py	Mon Apr 13 12:21:33 2015 -0400
@@ -133,7 +133,6 @@
         try:
             self.assertNotRegex('Ala ma kota', r'k.t', 'Message')
         except self.failureException as e:
-            self.assertIn("'kot'", e.args[0])
             self.assertIn('Message', e.args[0])
         else:
             self.fail('assertNotRegex should have failed.')
@@ -329,6 +328,20 @@
                              "^unexpectedly identical: None$",
                              "^unexpectedly identical: None : oops$"])

+    def testAssertRegex(self):
+        self.assertMessages('assertRegex', ('foo', 'bar'),
+                            ["^Regex didn't match:",
+                             "^oops$",
+                             "^Regex didn't match:",
+                             "^Regex didn't match: (.*) : oops$"])
+
+    def testAssertNotRegex(self):
+        self.assertMessages('assertNotRegex', ('foo', 'foo'),
+                            ["^Regex matched:",
+                             "^oops$",
+                             "^Regex matched:",
+                             "^Regex matched: (.*) : oops$"])
+

     def assertMessagesCM(self, methodName, args, func, errors):
         """