<?php
$url = 'http://www.baidu.com/zongzi/oo.html';
$n = preg_match_all("/http:[\/]{2}[a-z]+[.]{1}[a-z\d\-]+[.]{1}[a-z\d]*[\/]*[A-Za-z\d]*[\/]*[A-Za-z\d]*[.]*html/",$url,$array);
var_dump($array);
?>