Java_正则表达式判断IP格式

public class Demo {
    public static void main(String[] args) {
//        System.out.println("Hello world!");测试用
        System.out.println(isip("192.168.242.100"));//ip判断方法回调
    }
    public static boolean isip(String ip){
        boolean doip = ip.matches("([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])" +
                "(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}");
        return doip;
    }
//    "([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}"
//    Java正则表达式判断ip格式是否正确
//    matches方法用于正则匹配
}