http://detail.tmall.com/item.htm?id=18796056163
http://item.taobao.com/item.htm?spm=a220z.1000881.0.82&id=19150004171
http://item.taobao.com/item.htm?id=16181772778
这样的链接保留id=.... 的部分，其他都替换成
javascrpit:clickItem("18796056163");
javascrpit:clickItem("19150004171");
javascrpit:clickItem("16181772778");
------解决方案--------------------
这么有规律的URL，用explode，就可以了。参考
http://www.php.net/manual/zh/function.explode.php
$part = explode('id=','http://detail.tmall.com/item.htm?id=18796056163');
echo $part[1];
------解决方案--------------------
- PHP code
if(preg_match("/id=[\d]+$/",$url,$result)) { echo $result[1];}
------解决方案--------------------
- PHP code
$s=<<<txt<a target="_blank" href="http://detail.tmall.com/item.htm?id=4476817718"></a></div>......<div class="desc"><a target="_blank" href="http://detail.tmall.com/item.htm?id=4285064738" class="permalink" style="">描述</a></div>txt;echo preg_replace('/href=".+?id=(\d+)"/is',"href=\"javascrpit:clickItem('$1')\"",$s);
------解决方案--------------------
<?php
$s = <<<TEXT
<a target="_blank" href="http://hello.tmall.com/good.html?id=99888889">a</a>
<a target="_blank" href="http://hello.tmall.com/item.html?id=99888889">b</a>
<a target="_blank" href="http://hello.tmall.com/okitd.html?uid=099889999$id=99888889">c</a>
<a target="_blank" href="http://hello.tmall.com/item.html?cid=099889999">d</a>
<a target="_blank" href="http://detail.tmall.com/item.htm?spm=a2106.m874.1000384.d11&id=15393357623&pm2=1&source=dou&scm=1029.0.1.0">e</a>
<a target="_blank" href="http://item.taobao.com/item.htm?id=9999999999999">f</a>
TEXT;
echo preg_replace('/href=".+?item\\.html?.*?[^\\w]id=([0-9]+)(.*)"/i','href="javascrpit:clickItem(\'$1\')"',$s);
?>