正则表达式解析youtube yid

Question

示例网址

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

任何将从所有这4个用例中提取正确YID的正则表达式？第一种情况特别奇怪.

谢谢.

Answer 1

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

这有效.http://i.imgur.com/SQJW2.jpg

Answer 2

对于它的价值,这可以在http://rubular.com/上运行

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

为这些抓住第二个捕获组:

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

(编辑让我将URL作为代码标记,抱歉)