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 ts=new TreeSet();
		for(String s: ipArray)
		{
			ts.add(s);
		}
		for(String m:ts)
		{
			System.out.println(m.replaceAll("0*(\\d+)","$1"));
		}
	}
}