preg_replace('#<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/(.*?)"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/(.*?)" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>#i', '[youtube]http://www.youtube.com/watch?v=//1[/youtube]');