text: from django import template
  from django.core import urlresolvers
  
  import re
  
  register = template.Library()
  
  
  @register.simple_tag(takes_context=True)
  def current(context, url_name, return_value=' current', **kwargs):
      matches = current_url_equals(context, url_name, **kwargs)
      return return_value if matches else ''
  
  
  def current_url_equals(context, url_name, **kwargs):
      resolved = False
      try:
          resolved = urlresolvers.resolve(context.get('request').path)
      except:
          pass
      pattern = re.compile(url_name)
      matches = resolved and pattern.match(resolved.url_name)
      if matches and kwargs:
          for key in kwargs:
              kwarg = kwargs.get(key)
              resolved_kwarg = resolved.kwargs.get(key)
              if not resolved_kwarg or kwarg != resolved_kwarg:
                  return False
      return matches
  