find the first regex that match with the key
    :param key: a key to try to match against multiple regex
    :param match_candidates: a list of regexes to check if they match the key
    :return: the first candidate found

def find_first_regex_match(key, regex_candidates):
    """
    find the first regex that match with the key
    :param key: a key to try to match against multiple regex
    :param match_candidates: a list of regexes to check if they match the key
    :return: the first candidate found
    """
    for cand in regex_candidates:
        try:
            pattern = re.compile(cap_match_string(cand))
            if pattern.match(key):
                return cand
        except:
            logging.warn('[ros_interface] Ignoring invalid regex string "{0!s}"!'.format(cand))

    return None