ip地址正则表达式

p = re.compile('^((25[0-5]|2[0-4]d|[01]?dd?).){3}(25[0-5]|2[0-4]d|[01]?dd?)$')

if p.match(domain):
    current_app.logger.info('detect ip domain: {0}'.format(domain))
    return 'ip