webkitpy: Make all regex strings use raw string literals.

third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/cpp_unittest.py

 # -*- coding: utf-8; -*-
 #
 # Copyright (C) 2011 Google Inc. All rights reserved.
 # Copyright (C) 2009 Torch Mobile Inc.
 # Copyright (C) 2009 Apple Inc. All rights reserved.
 # Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
@@ skipping 2236 matching lines @@
         file_path = 'mydir/Foo.h'
 
         # We can't rely on our internal stuff to get a sane path on the open source
         # side of things, so just parse out the suggested header guard. This
         # doesn't allow us to test the suggested header guard, but it does let us
         # test all the other header tests.
         error_collector = ErrorCollector(self.assertTrue)
         self.process_file_data(file_path, 'h', [], error_collector)
         expected_guard = ''
         matcher = re.compile(
-            'No \#ifndef header guard found\, suggested CPP variable is\: ([A-Za-z_0-9]+) ')
+            r'No \#ifndef header guard found\, suggested CPP variable is\: ([A-Za-z_0-9]+) ')
         for error in error_collector.result_list():
             matches = matcher.match(error)
             if matches:
                 expected_guard = matches.group(1)
                 break
 
         # Make sure we extracted something for our header guard.
         self.assertNotEqual(expected_guard, '')
 
         # Wrong guard
@@ skipping 418 matching lines @@
         self.assertEqual('"', collapse('"\\\\\\"'))        # "\\\"  (bad)
         self.assertEqual('""', collapse('"\\\\\\\\"'))     # "\\\\" (string)
 
         self.assertEqual('\'\'', collapse('\'\''))         # ''     (empty)
         self.assertEqual('\'\'', collapse('\'a\''))        # 'a'    (char)
         self.assertEqual('\'\'', collapse('\'\\\'\''))     # '\''   (char)
         self.assertEqual('\'', collapse('\'\\\''))         # '\'    (bad)
         self.assertEqual('', collapse('\\012'))            # '\012' (char)
         self.assertEqual('', collapse('\\xfF0'))           # '\xfF0' (char)
         self.assertEqual('', collapse('\\n'))              # '\n' (char)
-        self.assertEqual('\#', collapse('\\#'))            # '\#' (bad)
+        self.assertEqual('\\#', collapse('\\#'))           # '\#' (bad)
 
         self.assertEqual('StringReplace(body, "", "");',
                          collapse('StringReplace(body, "\\\\", "\\\\\\\\");'))
         self.assertEqual('\'\' ""',
                          collapse('\'"\' "foo"'))
         self.assertEqual('""', collapse('"a" "b" "c"'))
 
 
 class OrderOfIncludesTest(CppStyleTestBase):
 
@@ skipping 2553 matching lines @@
     def test_ne(self):
         """Test __ne__ inequality function."""
         checker1 = self._checker()
         checker2 = self._checker()
 
         # != calls __ne__.
         # By default, __ne__ always returns true on different objects.
         # Thus, just check the distinguishing case to verify that the
         # code defines __ne__.
         self.assertFalse(checker1 != checker2)