webkitpy: Make all regex strings use raw string literals.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/diff_parser.py

 # Copyright (C) 2009 Google Inc. 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.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 16 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """WebKit's Python module for interacting with patches."""
 
 import logging
 import re
 
 _log = logging.getLogger(__name__)
 
 conversion_patterns = (
-    (re.compile("^diff --git \w/(.+) \w/(?P<FilePath>.+)"), lambda matched: "Index: " + matched.group('FilePath') + "\n"),
-    (re.compile("^new file.*"), lambda matched: "\n"),
-    (re.compile("^index (([0-9a-f]{7}\.\.[0-9a-f]{7})|([0-9a-f]{40}\.\.[0-9a-f]{40})) [0-9]{6}"),
+    (re.compile(r"^diff --git \w/(.+) \w/(?P<FilePath>.+)"), lambda matched: "Index: " + matched.group('FilePath') + "\n"),
+    (re.compile(r"^new file.*"), lambda matched: "\n"),
+    (re.compile(r"^index (([0-9a-f]{7}\.\.[0-9a-f]{7})|([0-9a-f]{40}\.\.[0-9a-f]{40})) [0-9]{6}"),
      lambda matched: ("=" * 67) + "\n"),
-    (re.compile("^--- \w/(?P<FilePath>.+)"), lambda matched: "--- " + matched.group('FilePath') + "\n"),
-    (re.compile("^\+\+\+ \w/(?P<FilePath>.+)"), lambda matched: "+++ " + matched.group('FilePath') + "\n"),
+    (re.compile(r"^--- \w/(?P<FilePath>.+)"), lambda matched: "--- " + matched.group('FilePath') + "\n"),
+    (re.compile(r"^\+\+\+ \w/(?P<FilePath>.+)"), lambda matched: "+++ " + matched.group('FilePath') + "\n"),
 )
 
 index_pattern = re.compile(r"^Index: (?P<FilePath>.+)")
 lines_changed_pattern = re.compile(r"^@@ -(?P<OldStartLine>\d+)(,\d+)? \+(?P<NewStartLine>\d+)(,\d+)? @@")
 diff_git_pattern = re.compile(r"^diff --git \w/")
 
 
 def git_diff_to_svn_diff(line):
     """Converts a git formatted diff line to a svn formatted line.
 
@@ skipping 119 matching lines @@
                 elif line.startswith(' '):
                     current_file.add_unchanged_line(old_diff_line, new_diff_line, line[1:])
                     old_diff_line += 1
                     new_diff_line += 1
                 elif line == '\\ No newline at end of file':
                     # Nothing to do.  We may still have some added lines.
                     pass
                 else:
                     _log.error('Unexpected diff format when parsing a chunk: %r', line)
         return files