php - Regex to parse youtube yid

Question

Example URLs

http://www.youtube.com/user/Scobleizer#p/u/1/1p3vcRhsYGo
http://www.youtube.com/watch?v=cKZDdG9FTKY&feature=channel
http://www.youtube.com/watch?v=yZ-K7nCVnBI&playnext_from=TL&videos=osPknwzXEas&feature=sub
http://www.youtube.com/ytscreeningroom?v=NRHVzbJVx8I

Any regex that will pull the correct YID from all 4 of these use cases? The first case is especially odd.

Thank you.

Answer 1

(?<=v=)[a-zA-Z0-9-_]+(?=&)|(?<=[0-9]/)[^&
]+|(?<=v=)[^&
]+

This works. http://i.imgur.com/SQJW2.jpg