mark regex as regex for pycodestyle

Change-Id: Id66a3e4d574fa4da5fbffe6a1aa24c5ea23ab8cc

openstack_requirements/cmds/check_py2.py

@@ -74,5 +74,6 @@ def main():
             for classifier in classifiers:
                 print('  {}'.format(classifier))
 
+
 if __name__ == '__main__':
     main()

openstack_requirements/requirement.py

@@ -75,8 +75,8 @@ Requirements = collections.namedtuple('Requirements', ['reqs'])
 
 
 url_re = re.compile(
-    '^(?P<url>\s*(?:-e\s)?\s*(?:(?:[a-z]+\+)?(?:[a-z]+))://[^#]*)'
-    '#egg=(?P<name>[-\.\w]+)')
+    r'^(?P<url>\s*(?:-e\s)?\s*(?:(?:[a-z]+\+)?(?:[a-z]+))://[^#]*)'
+    r'#egg=(?P<name>[-\.\w]+)')
 
 
 def canonical_name(req_name):

tools/check-install.py

@@ -11,7 +11,7 @@ import six.moves.configparser as configparser
 
 def main():
     errors = 0
-    pattern = re.compile('^(.*?)\s*=\s*([^:]*?):.*$')
+    pattern = re.compile(r'^(.*?)\s*=\s*([^:]*?):.*$')
     config = configparser.ConfigParser()
     config.read('setup.cfg')
     console_scripts = config.get('entry_points', 'console_scripts')