old_contents: from django.conf.urls.defaults import RegexURLPattern
  
  def url(pattern, name=None, extra={}):
      
      def url_annotator(view):
          view.pattern = RegexURLPattern(pattern, view, extra, name)
          return view
      
      return url_annotator
  
new_contents: from django.core.urlresolvers import RegexURLPattern
  
  def url(pattern, name=None, extra={}):
      
      def url_annotator(view):
          view.pattern = RegexURLPattern(pattern, view, extra, name)
          return view
      
      return url_annotator
  
subject: Make new URL tag forward compatible