webkitpy: Make all regex strings use raw string literals.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/queries.py

 # Copyright (c) 2009 Google Inc. All rights reserved.
 # Copyright (c) 2009 Apple Inc. All rights reserved.
 # Copyright (c) 2012 Intel Corporation. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 141 matching lines @@
     def __init__(self):
         options = [
             make_option('--all', action='store_true', default=False,
                         help='display the baselines for *all* tests'),
             make_option('--csv', action='store_true', default=False,
                         help='Print a CSV-style report that includes the port name, test_name, test platform, baseline type, baseline location, and baseline platform'),
             make_option('--include-virtual-tests', action='store_true',
                         help='Include virtual tests'),
         ] + platform_options(use_globs=True)
         super(PrintBaselines, self).__init__(options=options)
-        self._platform_regexp = re.compile('platform/([^\/]+)/(.+)')
+        self._platform_regexp = re.compile(r'platform/([^\/]+)/(.+)')
 
     def execute(self, options, args, tool):
         if not args and not options.all:
             print "You must either specify one or more test paths or --all."
             return
 
         default_port = tool.port_factory.get()
         if options.platform:
             port_names = fnmatch.filter(tool.port_factory.all_port_names(), options.platform)
             if not port_names:
@@ skipping 23 matching lines @@
                     print "%s,%s,%s,%s,%s,%s" % (port_name, test_name, self._platform_for_path(test_name),
                                                  extension[1:], baseline_location, self._platform_for_path(baseline_location))
                 else:
                     print baseline_location
 
     def _platform_for_path(self, relpath):
         platform_matchobj = self._platform_regexp.match(relpath)
         if platform_matchobj:
             return platform_matchobj.group(1)
         return None