最近要写一个把用户输入的网址改为超链接的需求，最后用正则解决，匹配 可能的网址

果然还是要好好学学java的正则表达式，
本例子使用java se 1.4新增的正则表达式 匹配 循环找出用户输入的字符串中可是是网址的子字符串，并且替换为带 a 标签。

 private void getRealMsg(Stream ps){
                String urlreg = "((http|https)://){0,1}[\\w]+[\\.:][\\w.!@#$%^?=&\\-\\+:*\\d/]+"; 
		pattern = Pattern.compile(urlreg, Pattern.CASE_INSENSITIVE);
		String content = ps.getPushcontent();
		if(content.trim().length() < 4){
			return;
		}
		content = content.replaceAll("<script", "&lt;script");
		content = content.replaceAll("script>", "script&gt;");
		Matcher mac = pattern.matcher(content);
		ArrayList<String> list = new ArrayList<String>();
		ArrayList<String> rlist = new ArrayList<String>();
		String src = null;
		try {
			while(mac.find()){
				src = mac.group();
				list.add(src);
			}
		} catch (Exception e) {
			Logs.getLog(StreamDao.class).error(e);
			return;
		}
		if(list.size() < 1){
			return;
		}
		for(String s : list){
			rlist.add(content.substring(0, content.indexOf(s) + s.length()));
			content = content.substring(content.indexOf(s) + s.length(), content.length());
		}
		int i = 0;
		for(String s : list){
			if(s.startsWith("http")){
				rlist.set(i, rlist.get(i).replace(s, "<a href=\"" + s + "\" target=\"_blank\">" + s + "</a>"));
			}else{
				rlist.set(i, rlist.get(i).replace(s, "<a href=\"http://" + s + "\" target=\"_blank\">" + s + "</a>"));
			}
			i++;
		}
		StringBuilder sb = new StringBuilder();
		for(String s : rlist){
			sb.append(s);
		}
		ps.setPushcontent(sb.toString());
	}

写正则的必备网址啊，可以在线编辑正则，Flash实现~~~

  http://gskinner.com/RegExr/