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    copied!<p>There are many, many questions on SO about regexping Youtube video IDs - just do a Google or site search. I took the liberty to modify <a href="https://stackoverflow.com/questions/5830387/php-regex-find-all-youtube-video-ids-in-string">this answer by ridgerunner</a> to do what you want, ie. replace a Youtube URL with the embed code. Have a look and edit the pattern or embed code if needed. For example, you might want to wrap the embedded video in a <code>div</code>.</p> <pre><code>&lt;?php // Replace Youtube URLs with embed code function embedYoutube($text) { $search = '~ # Match non-linked youtube URL in the wild. (Rev:20130823) (?:https?://)? # Optional scheme. (?:[0-9A-Z-]+\.)? # Optional subdomain. (?: # Group host alternatives. youtu\.be/ # Either youtu.be, | youtube # or youtube.com or (?:-nocookie)? # youtube-nocookie.com \.com # followed by \S* # Allow anything up to VIDEO_ID, [^\w\s-] # but char before ID is non-ID char. ) # End host alternatives. ([\w-]{11}) # $1: VIDEO_ID is exactly 11 chars. (?=[^\w-]|$) # Assert next char is non-ID or EOS. (?! # Assert URL is not pre-linked. [?=&amp;+%\w.-]* # Allow URL (query) remainder. (?: # Group pre-linked alternatives. [\'"][^&lt;&gt;]*&gt; # Either inside a start tag, | &lt;/a&gt; # or inside &lt;a&gt; element text contents. ) # End recognized pre-linked alts. ) # End negative lookahead assertion. [?=&amp;+%\w.-]* # Consume any URL (query) remainder. ~ix'; $replace = '&lt;object width="425" height="344"&gt; &lt;param name="movie" value="http://www.youtube.com/v/$1?fs=1"&lt;/param&gt; &lt;param name="allowFullScreen" value="true"&gt;&lt;/param&gt; &lt;param name="allowScriptAccess" value="always"&gt;&lt;/param&gt; &lt;embed src="http://www.youtube.com/v/$1?fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" width="425" height="344"&gt; &lt;/embed&gt; &lt;/object&gt;'; return preg_replace($search, $replace, $text); } $string = 'This is the forum post content with some Youtube links:'."\n". 'http://www.youtube.com/watch?v=NLqAF9hrVbY'."\n". 'http://www.youtube.com/v/u1zgFlCw8Aw?fs=1&amp;hl=en_US'; echo embedYoutube($string); ?&gt; </code></pre>
 

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