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    <p>You can achieve this by using <code>preg_replace</code>, 2 patterns and two replacememts:</p> <pre><code>&lt;?php $add = "utm=some&amp;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( "$1&amp;".$add, # replacement if first pattern take place '$1?'.$add # replacement if second pattern take place ); $str = 'Lorem ipsum &lt;a href="http://www.me.com"&gt;dolor sit&lt;/a&gt; amet, &lt;a href="http://www.me.com/page.php?id=10"&gt;consectetur&lt;/a&gt; elit.'; $str = preg_replace($patterns, $replacements, $str); echo $str; /* Output: Lorem ipsum &lt;a href="http://www.me.com&amp;utm=some&amp;medium=stuff"&gt;dolor sit&lt;/a&gt; amet, &lt;a href="http://www.me.com/page.php?id=10&amp;utm=some&amp;medium=stuff"&gt;consectetur&lt;/a&gt; elit. */ ?&gt; </code></pre> <p>I liked others answers using DOM-solutions, then I tested the time each snippet takes for the following input:</p> <pre><code>&lt;a href="http://www.me.com"&gt;Lorem&lt;/a&gt; &lt;a href="http://www.me.com/"&gt;ipsum&lt;/a&gt; &lt;a href="http://www.me.com/#section-2"&gt;dolor&lt;/a&gt; &lt;a href="http://www.me.com/path-to-somewhere/file.php"&gt;sit&lt;/a&gt; &lt;a href="http://www.me.com/?"&gt;amet&lt;/a&gt;, &lt;a href="http://www.me.com/?foo=bar"&gt;consectetur&lt;/a&gt; &lt;a href="http://www.me.com/?foo=bar#section-3"&gt;elit&lt;/a&gt;. </code></pre> <p>With <code>microtime</code>:</p> <pre><code>$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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    1. POPHP alter url in html
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    1. COYour solution is indeed very slick! But there seems to be a bug in the domain checking pattern.. This does not work: `'/(https?:\/\/(?:www)?me.com(?=.*?\?)[^"]*)/',` `'/(https?:\/\/(?:www)?me.com(?!.*?\?)[^"]*)/'` This work: `'/(https?:\/\/(?=.*?\?)[^"]*)/',` `'/(https?:\/\/(?!.*?\?)[^"]*)/'`
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    2. CO@Maria oh yes. I just forgot to put a backslash before dot : `me\.com` I updated answer.
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