#!/usr/bin/python3 # -*- coding: utf-8 -*- import re ip = "192.168.1.1" ip = re.findall("^(1d{2}|2[0-4]d|25[0-5]|[1-9]d|[1-9]).(1d{2}|2[0-4]d|25[0-5]|[1-9]d|d).(1d{2}|2[0-4]d|25[0-5]|[1-9]d|d).(1d{2}|2[0-4]d|25[0-5]|[1-9]d|d)$", ip) print(ip) if not ip: print("no") else: print("yes")