import java.util.regex.Matcher;import java.util.regex.Pattern;/** * JavaString * com.xuyanghui.regularexPRession * 15-10-24 * 下午2:31 * YANGHUI XU */public class Regular {    public static void main(String[] args) {        String ip = "192.168.1.108";        String patternString = "(([0,1]?//d?//d|2[0-4]//d|25[0-5])//.){3}([0,1]?//d?//d|2[0-4]//d|25[0-5])";        Pattern pattern = Pattern.compile(patternString);        Matcher matcher = pattern.matcher(ip);        System.out.println(matcher.matches());    }}