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copied!<p>You can achieve this by using <code>preg_replace</code>, 2 patterns and two replacememts:</p> <pre><code><?php $add = "utm=some&medium=stuff"; $patterns = array( '/(https?:\/\/(?:www)?me\.com(?=.*?\?)[^"]*)/', # positive lookahead to check if there is a ? mark in url '/(https?:\/\/(?:www)?me\.com(?!.*?\?)[^"]*)/' # negative lookahead to check if ? mark is not in ); $replacements = array( "$1&".$add, # replacement if first pattern take place '$1?'.$add # replacement if second pattern take place ); $str = 'Lorem ipsum <a href="http://www.me.com">dolor sit</a> amet, <a href="http://www.me.com/page.php?id=10">consectetur</a> elit.'; $str = preg_replace($patterns, $replacements, $str); echo $str; /* Output: Lorem ipsum <a href="http://www.me.com&utm=some&medium=stuff">dolor sit</a> amet, <a href="http://www.me.com/page.php?id=10&utm=some&medium=stuff">consectetur</a> elit. */ ?> </code></pre> <p>I liked others answers using DOM-solutions, then I tested the time each snippet takes for the following input:</p> <pre><code><a href="http://www.me.com">Lorem</a> <a href="http://www.me.com/">ipsum</a> <a href="http://www.me.com/#section-2">dolor</a> <a href="http://www.me.com/path-to-somewhere/file.php">sit</a> <a href="http://www.me.com/?">amet</a>, <a href="http://www.me.com/?foo=bar">consectetur</a> <a href="http://www.me.com/?foo=bar#section-3">elit</a>. </code></pre> <p>With <code>microtime</code>:</p> <pre><code>$ts = microtime(true); // codes printf("%.10f\n", microtime(true) - $ts); </code></pre> <p>That you can see them below (ms):</p> <pre><code>@squeamish ossifrage: 0.0001089573 @Cobra_Fast: 0.0003509521 @Emissary: 0.0094890594 @Me: 0.0000669956 </code></pre> <p>That was interesting to me, <code>RegEx</code>es done well.</p>

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