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    copied!<p>Here is a fix:</p> <pre><code>&lt;?php function _check4Links($text){ $pattern = '#\b(([\w-]+://?|www[.])[^\s()&lt;&gt;]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))#'; return preg_replace_callback($pattern, 'fnc', $text); } function fnc($matches) { $url = array_shift($matches); $url_parts = parse_url($url); if(preg_match("%(?:youtube\.com/(?:user/.+/|(?:v|e(?:mbed)?)/|.*[?&amp;]v=)|youtu\.be/)([^\"&amp;?/ ]{11})%i", $url, $match)){ return '&lt;iframe title="YouTube video player" class="youtube-player" type="text/html" width="400" height="244" src="http://www.youtube.com/embed/'.$match[1].'" frameborder="0" allowFullScreen&gt;&lt;/iframe&gt;'; } else { $text = parse_url($url, PHP_URL_HOST) . parse_url($url, PHP_URL_PATH); $text = preg_replace("/^www./", "", $text); $last = -(strlen(strrchr($text, "/"))) + 1; if ($last &lt; 0) { $text = substr($text, 0, $last) . "&amp;hellip;"; } return sprintf('&lt;a target="_blank"rel="nofollow" href="%s"&gt;%s&lt;/a&gt;', $url, $text); } } $txt = &lt;&lt;&lt;TXT Let's do some tests! http://www.google.com http://www.youtube.com/watch?v=L25R4DR79mU TXT; echo _check4Links($txt); ?&gt; </code></pre> <p>The output is:</p> <pre><code>Let's do some tests! &lt;a target="_blank"rel="nofollow" href="http://www.google.com"&gt;google.com&lt;/a&gt; &lt;iframe title="YouTube video player" class="youtube-player" type="text/html" width="400" height="244" src="http://www.youtube.com/embed/L25R4DR79mU" frameborder="0" allowFullScreen&gt;&lt;/iframe&gt; </code></pre>
 

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