原本链接:<a href="http://www.csdn.net/1.html">链接1</a><a href="/post-1.html">链接1</a>
<a href="/post-2.html">链接2</a>
<a href="/post-3.html">链接3</a>
<a href="/post-4.html">链接4</a>
如何替换为:<a href="http://www.csdn.net/1.html">链接1</a> (该条链接不变)
<a href="/m/?post-1">链接1</a>
<a href="/m/?post-2">链接2</a>
<a href="/m/?post-3">链接3</a>
<a href="/m/?post-4">链接4</a>
<a href="/post-2.html">链接2</a>
<a href="/post-3.html">链接3</a>
<a href="/post-4.html">链接4</a>
如何替换为:<a href="http://www.csdn.net/1.html">链接1</a> (该条链接不变)
<a href="/m/?post-1">链接1</a>
<a href="/m/?post-2">链接2</a>
<a href="/m/?post-3">链接3</a>
<a href="/m/?post-4">链接4</a>
<a href="http://www.csdn.net/1.html">链接1</a><a href="/post-1.html">链接1</a>
<a href="/post-2.html">链接2</a>
<a href="/post-3.html">链接3</a>
<a href="/post-4.html">链接4</a>
TXT;
$s = preg_replace('#href="/#', '$0m/?', $s);
echo $s;<a href="http://www.csdn.net/1.html">链接1</a><a href="/m/?post-1.html">链接1</a>
<a href="/m/?post-2.html">链接2</a>
<a href="/m/?post-3.html">链接3</a>
<a href="/m/?post-4.html">链接4</a>
替换出来的网址只m/?post-4.html 而不是 m/?post-4 html都去除不了……
<a href="http://www.csdn.net/1.html">链接1</a>
<a href="/post-1.html">链接1</a>
<a href="/post-2.html">链接2</a>
<a href="/post-3.html">链接3</a>
<a href="/post-4.html">链接4</a>
html;
echo preg_replace('#(<a href="/)([^.]+)\.html(.+)#m','$1m/?$2$3',$s);