m/([01]?\d\d?|2[0-4]\d|25[0-5]) \. ([01]?\d\d?|2[0-4]\d|25[0-5]) \. ([01]?\d\d?|2[0-4]\d|25[0-5]) \. ([01]?\d\d?|2[0-4]\d|25[0-5])(.*)/x