正则表达式 对ip地址排序（用到了分割和替换）

import java.util.*;class L{public static void main(String[] args){String ip="192.168.0.1 134.3.6.7 232.4.34.67 4.5.6.7";ip=ip.replaceAll("(\\d+)","00$1");System.out.println(ip);ip=ip.replaceAll("0*(\\d{3})","$1");System.out.println(ip);String[] ipArray=ip.split(" ");TreeSet<String> ts=new TreeSet<String>();for(String s: ipArray){ts.add(s);}for(String m:ts){System.out.println(m.replaceAll("0*(\\d+)","$1"));}}}