Android IP地址、子网掩码、默认网关、首选DNS服务器、备用DNS服务器校验

 public String isIP(String ip) {String regex = "(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)){3}";Pattern p = Pattern.compile(regex)