docs: def active_path(context, pattern, css=None):
      """
      Highlight menu item based on path.
      
      Returns a css class if ``request.path`` is in given ``pattern``.
      
      :param pattern:
          Regex url pattern.
  
      :param css:
          Css class to be returned for highlighting. Return active if none set.
  
      """
      request = context['request']
      #pattern = "^" + pattern + "$"
      if re.search(pattern, request.path):
          return css if css else 'active'
      return ''