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.

Tactics

Look here: stackoverflow.com/questions/tagged/youtube+regex – Wrist

As far as I can tell, nobody else has handled my first test case. – Tactics

Use them as examples and adapt. It's not that difficult. – Isochromatic

I've updated my regex answer over on the: "php regex - find all youtube video ids in string" question to handle these (new to me) YouTube URL syntaxes. – Combination

Answer 1

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

This works. https://i.sstatic.net/J7yXK.jpg

Ushaushant

This needs to be modified to: (?<=v=)[a-zA-Z0-9-_]+(?=&)|(?<=[0-9]/)[^&\n]+|(?<=v=)[^&\n]+ to allow for _ – Capeskin

Had to add backslash for php (?<=v=)[a-zA-Z0-9-_]+(?=&)|(?<=[0-9]\/)[^&\n]+|(?<=v=)[^&\n]+ – Gi

Answer 2

For what it's worth, this worked on http://rubular.com/

(v=|\/)([\w-]+)(&.+)?$

Grabbing second capture group for these:

http://www.youtube.com/user/SilkRoadTheatre#p/a/u/2/6dwqZw0j_jY
http://youtu.be/6dwqZw0j_jY
http://www.youtube.com/watch?v=6dwqZw0j_jY&feature=youtu.be
http://youtu.be/afa-5HQHiAs
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

(the editor made me tab the URLs in as code, sorry)

Kummerbund

Best regexp I've seen. You only have to check for match group 2 but it's pretty neat. BTW: This returns the id in match group 1 [v=|\/]([\w-]+)(&.+)?$ – Talc