need a help replace words with php

The original words

$string = '<a href="/home/top">here is some text</a>. <a href="/links/abc">some links here</a>...';
//more links and other html. more link like <a href="/home/below">, <a href="/links/def">...

I need change to

<a h开发者_如何转开发ref="/links/abc"> => <a href="#" onclick="link('abc|123')">
<a href="/links/def"> => <a href="#" onclick="link('def|123')">
<a href="/links/ghi"> => <a href="#" onclick="link('ghi|123')">

I tried to use str_replace, but it just easy to replace <a href=" to <a href="#" onclick="link(' and hard to judge the next part. but how to deal with these replace? Thanks.

pattern: $pattern = '@<a href=\"/links/([a-zA-Z0-9]*)\">@is';

replace: $replace = '<a href="#" onclick="link(\'\1|123\')">';

call: $result = preg_replace($pattern, $replace, $string);

You can use preg_replace():

$string = preg_replace('%href="/links/(.+?)"%', 'href="#" onclick="link(\'$1|123\')"', $string);