正则之匹配IP

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class test0726 {
    public static boolean isIp(String ip){
        String pattern = "((\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])\\.){3}(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])";
        Pattern r = Pattern.compile(pattern);
        Matcher m = r.matcher(ip);
        return m.matches();
    }


    public static void main(String[] args) {
        String content = "123.2.1.2";
        System.out.println(isIp(content));
    }
}