Filter the match_candidates list to return only the candidate that match the regex
    :param regex: a regex used to filter the list of candidates
    :param match_candidates: the list of candidates
    :return: the filtered list of only the candidates that match the regex

def regex_match_sublist(regex, match_candidates):
    """
    Filter the match_candidates list to return only the candidate that match the regex
    :param regex: a regex used to filter the list of candidates
    :param match_candidates: the list of candidates
    :return: the filtered list of only the candidates that match the regex
    """
    matches = []
    try:
        pattern = re.compile(cap_match_string(regex))
        matches = [cand for cand in match_candidates if pattern.match(cand)]
    except:
        logging.warn('[ros_interface] Ignoring invalid regex string "{0!s}"!'.format(regex))
    return matches