regex to replace contend of second <p>-tag : <p>Output (var $DESC)</p>

<pre><code> &lt;p&gt;erster Absatz&lt;/p&gt;
 &lt;p&gt;zweiter Absatz&lt;/p&gt;
</code></pre>

<p>Regex (PHP)</p>

<pre><code> preg_replace("&lt;([a-z][a-z0-9]*)\b[^&gt;]*&gt;(.*?)&lt;/\1&gt;{2}", '', $DESC)
</code></pre>

<p>I would like to delete only the second p but this regex finds both. Thanks for any help.</p>
