java匹配IP正则表达式

Leytton:网上好多错的，亲测留着备用

import java.util.regex.Matcher;import java.util.regex.Pattern;public class IsIp {public static void main(String[] args) {System.out.println(isboolIp(""));System.out.println(isboolIp("192.168.1.1"));System.out.println(isboolIp("256.2.3.4"));System.out.println(isboolIp("1.2.3.4"));System.out.println(isboolIp("1.2.3.4.5"));System.out.println(isboolIp("1.2.3.4."));}/** * 判断是否为合法IP * @return the ip */    public static boolean isboolIp(String ipAddress) {        String ip = "([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}";         Pattern pattern = Pattern.compile(ip);        Matcher matcher = pattern.matcher(ipAddress);        return matcher.matches();    }}