Youtube url scraping

I am trying to build a spider that will go to youtube and cache video page links. I need a regex or simililar that will decide whether a link is for a video page or not. You know, urls like:

Heck, even if you have something already that I can study and tear apart, that would be cool too. Learning is half the fun!

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try this, it will return only valid video links
$html = file_get_contents($url);
$preg = '/<a href="\/watch\?v=(.*?)">.*?<\/a>/';
preg_match_all($preg,$html,$results, PREG_SET_ORDER );

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phpintheusaAuthor Commented:
Thank you, you both gave good info for me to learn from! The Dr gets the most because he coded exactly what I needed to see. Thank you both!!
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