使用regex从文本获取Url

/*

 * PinDroid - http://code.google.com/p/PinDroid/

 *

 * Copyright (C) 2010 Matt Schmidt

 *

 * PinDroid is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published

 * by the Free Software Foundation; either version 3 of the License,

 * or (at your option) any later version.

 *

 * PinDroid is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with PinDroid; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307

 * USA

 */
 /*
  from 时 代 J a v a - N o w J a v a . c o m 
 */

//package com.nowjava;

import java.util.regex.Matcher;

import java.util.regex.Pattern;


public class Main {

    public static String getUrl(String s) {

        String result = "";


        Pattern pattern = Pattern

                .compile("\\b(https?|ftp|file)://[-a-zA-Z0-9+&@'#/%?=~_|!:,.;()]*[-a-zA-Z0-9+&@'#/%=~_|()]");


        try {

            Matcher matcher = pattern.matcher(s);


            if (matcher.f