diff --git a/features/features_constants.py b/features/features_constants.py
index b21a7f5..8427d26 100644
--- a/features/features_constants.py
+++ b/features/features_constants.py
@@ -1,7 +1,6 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file or at
-# https://developers.google.com/open-source/licenses/bsd
+# Copyright 2016 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
 
 """Some constants used in Monorail hotlist pages."""
 from __future__ import print_function
@@ -16,7 +15,7 @@
 OTHER_BUILT_IN_COLS = (
     tracker_constants.OTHER_BUILT_IN_COLS + ['Adder', 'Added', 'Note'])
 # pylint: disable=line-too-long
-ISSUE_INPUT_REGEX = '%s:\d+(([,]|\s)+%s:\d+)*' % (
+ISSUE_INPUT_REGEX = r'%s:\d+(([,]|\s)+%s:\d+)*' % (
     project_constants.PROJECT_NAME_PATTERN,
     project_constants.PROJECT_NAME_PATTERN)
 FIELD_DEF_NAME_PATTERN = '[a-zA-Z]([_-]?[a-zA-Z0-9])*'