diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index 9891803..cbbe2b5 100644
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -952,6 +952,18 @@
             msg = '%s: %r not found in %r' % (msg, expected_regexp.pattern, text)
             raise self.failureException(msg)
 
+    def assertNotRegexpMatches(self, text, unexpected_regexp, msg=None):
+        if isinstance(unexpected_regexp, basestring):
+            unexpected_regexp = re.compile(unexpected_regexp)
+        match = unexpected_regexp.search(text)
+        if match:
+            msg = msg or "Regexp matched"
+            msg = '%s: %r matches %r in %r' % (msg,
+                                               text[match.start():match.end()],
+                                               unexpected_regexp.pattern,
+                                               text)
+            raise self.failureException(msg)
+
 
 class FunctionTestCase(TestCase):
     """A test case that wraps a test function.
diff --git a/Lib/unittest/test/test_assertions.py b/Lib/unittest/test/test_assertions.py
index 5d77ce8..1880059 100644
--- a/Lib/unittest/test/test_assertions.py
+++ b/Lib/unittest/test/test_assertions.py
@@ -91,6 +91,16 @@
         else:
             self.fail("assertRaises() didn't let exception pass through")
 
+    def testAssertNotRegexpMatches(self):
+        self.assertNotRegexpMatches('Ala ma kota', r'r+')
+        try:
+            self.assertNotRegexpMatches('Ala ma kota', r'k.t', 'Message')
+        except self.failureException, e:
+            self.assertIn("'kot'", e.args[0])
+            self.assertIn('Message', e.args[0])
+        else:
+            self.fail('assertNotRegexpMatches should have failed.')
+
 
 class TestLongMessage(unittest.TestCase):
     """Test that the individual asserts honour longMessage.