@classmethod
def _make_valid_url(cls):
    return ('%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\\s\\S]+)' % cls._SEARCH_KEY)
@classmethod
def _make_valid_url(cls):
    return ('%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\\s\\S]+)' % cls._SEARCH_KEY)