If your couple of individuals don't know Wordpress's YouTub tag, it appears such as this

[youtube=http://www.youtube.com/watch?v=ooCLnrmIRFo&feature=related]

I'm not so good with regular expressions, and all sorts of I've discovered how you can do is get from my way through between "[youtube=" and "]" while using following, however i need the need for "v".

(\[youtube=)(.+)(\])

Your assistance is much appreciated.

\[youtube=http://[^\]]+v=([\w-]+)[^\]]*\]

However, it might be easier to just extract the URL after which apply certain validation onto it, and lastly pass it to parse_url and parse_str($url['query'], $blah) => $blah['v'] may have the v param then.