java怎样通过正则表达式判断下面的IP

Posted 2023-03-02

java怎样通过正则表达式判断10.1.107.0/24, 10.1.8.234/32等是IP地址，再帮我详细解释一下呗！

参考技术A String ipv4Regex = "^(([0-9]|[1-9][0-9]|[1-2][1-5][0-5])\\.)3([0-9]|[1-9][0-9]|[1-2][1-5][0-5])(/([1-9]|[1-2][0-9]|3[01]))?$";
System.out.println("254.0.0.0/31".matches(ipv4Regex));
System.out.println("254.0.0.0/32".matches(ipv4Regex));
System.out.println("256.0.0.0/31".matches(ipv4Regex));

System.out.println("1.2.3.255".matches(ipv4Regex));
System.out.println("1.2.3.256".matches(ipv4Regex)); 参考技术B package com;

public class Joey

public static void main(String[] args)

String ip = "10.1.107.0/24";
String reg = "^((2[0-4]\\\\d|25[0-5]|[01]?\\\\d\\\\d?)\\\\.)3(2[0-4]\\\\d|25[0-5]|[01]?\\\\d\\\\d?)/\\\\d+$";
System.out.println(ip.matches(reg));

追问

谢谢你，现在想把10.1.7.85这种也算成IP，也就是10.1.107.0/24和10.1.7.85都是IP，应该怎样写

追答

String reg = "^((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.)3(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)(/\\d+)?$"

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