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    copied!<p>This is a little bit tricky, but the following code should work if your URLs are all enclosed in quotation marks (single or double). It will also handle fragment identifiers (like <code>#section-2</code>).</p> <pre><code>$url_modifier = 'utm=some&amp;medium=stuff'; $url_modifier_domain = preg_quote('www.me.com'); $html_text = preg_replace_callback( '#((?:https?:)?//'.$url_modifier_domain.'(/[^\'"\#]*)?)(?=[\'"\#])#i', function($matches){ global $url_modifier; if (!isset($matches[2])) return $matches[1]."/?$url_modifier"; $q = strpos($matches[2],'?'); if ($q===false) return $matches[1]."?$url_modifier"; if ($q==strlen($matches[2])-1) return $matches[1].$url_modifier; return $matches[1]."&amp;$url_modifier"; }, $html_text); </code></pre> <p>Input:</p> <pre><code>&lt;a href="http://www.me.com"&gt;Lorem&lt;/a&gt; &lt;a href="http://www.me.com/"&gt;ipsum&lt;/a&gt; &lt;a href="http://www.me.com/#section-2"&gt;dolor&lt;/a&gt; &lt;a href="http://www.me.com/path-to-somewhere/file.php"&gt;sit&lt;/a&gt; &lt;a href="http://www.me.com/?"&gt;amet&lt;/a&gt;, &lt;a href="http://www.me.com/?foo=bar"&gt;consectetur&lt;/a&gt; &lt;a href="http://www.me.com/?foo=bar#section-3"&gt;elit&lt;/a&gt;. </code></pre> <p>Output:</p> <pre><code>&lt;a href="http://www.me.com/?utm=some&amp;medium=stuff"&gt;Lorem&lt;/a&gt; &lt;a href="http://www.me.com/?utm=some&amp;medium=stuff"&gt;ipsum&lt;/a&gt; &lt;a href="http://www.me.com/?utm=some&amp;medium=stuff#section-2"&gt;dolor&lt;/a&gt; &lt;a href="http://www.me.com/path-to-somewhere/file.php?utm=some&amp;medium=stuff"&gt;sit&lt;/a&gt; &lt;a href="http://www.me.com/?utm=some&amp;medium=stuff"&gt;amet&lt;/a&gt;, &lt;a href="http://www.me.com/?foo=bar&amp;utm=some&amp;medium=stuff"&gt;consectetur&lt;/a&gt; &lt;a href="http://www.me.com/?foo=bar&amp;utm=some&amp;medium=stuff#section-3"&gt;elit&lt;/a&gt;. </code></pre>
 

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