webkitpy: Make all regex strings use raw string literals.

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

 # -*- coding: utf-8 -*-
 #
 # Copyright (C) 2009, 2010, 2012 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 3629 matching lines @@
     Args:
       processing_file: The name of the processing file.
       line_number: The number of the line to check.
       line: The line of code to check.
       error: The function to call with any errors found.
     """
     matched = search(r'\bstatic_cast<(\s*\w*:?:?\w+\s*\*+\s*)>', line)
     if not matched:
         return
 
-    class_name = re.sub('[\*]', '', matched.group(1))
+    class_name = re.sub(r'[\*]', '', matched.group(1))
     class_name = class_name.strip()
     # Ignore (for now) when the casting is to void*,
     if class_name == 'void':
         return
 
     namespace_pos = class_name.find(':')
     if not namespace_pos == -1:
         class_name = class_name[namespace_pos + 2:]
 
     header_file = ''.join((class_name, '.h'))
@@ skipping 522 matching lines @@
 
     def check(self, lines):
         _process_lines(self.file_path, self.file_extension, lines,
                        self.handle_style_error, self.min_confidence)
 
 
 # FIXME: Remove this function (requires refactoring unit tests).
 def process_file_data(filename, file_extension, lines, error, min_confidence, fs=None):
     checker = CppChecker(filename, file_extension, error, min_confidence, fs)
     checker.check(lines)