code: def default_reply(*args, **kwargs):
      
      invoked = bool(not args or kwargs)
      matchstr = kwargs.pop('matchstr', r'^.*$')
      flags = kwargs.pop('flags', 0)
  
      if not invoked:
          func = args[0]
  
      def wrapper(func):
          PluginsManager.commands['default_reply'][
              re.compile(matchstr, flags)] = func
          logger.info('registered default_reply plugin "%s" to "%s"', func.__name__,
                      matchstr)
          return func
  
      return wrapper if invoked else wrapper(func)
docs: Decorator declaring the wrapped function to the default reply hanlder.
  
      May be invoked as a simple, argument-less decorator (i.e. ``@default_reply``) or
      with arguments customizing its behavior (e.g. ``@default_reply(matchstr='pattern')``).