java-后台正则校验ip是否合法

public static boolean isIpv4(String... ipstr){
        String regIp = "^([1-9]|[1-9]\\d|1\\d{2}|2[0-1]\\d|22[0-3])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}$";

        for(String ip : ipstr){
            boolean flag = ip.matches(regIp);
            if(!flag){
                return false;
            }
        }
        return true;
    }