function parser(url){
    var regExp = /^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\/)|(\?v=|\&v=))([^#\&\?]*).*/;
    var match = url.match(regExp);
    if (match && match[8].length==11){
            alert('OK');
    }else{
            alert('BAD');
    }
}

测试:

https://www.youtube.com/embed/vDoO_bNw7fc - attention first symbol «v» in «vDoO_bNw7fc»

http://www.youtube.com/user/dreamtheater#p/u/1/oTJRivZTMLs
https://youtu.be/oTJRivZTMLs?list=PLToa5JuFMsXTNkrLJbRlB--76IAOjRM9b
http://www.youtube.com/watch?v=oTJRivZTMLs&feature=youtu.be
https://youtu.be/oTJRivZTMLs
http://youtu.be/oTJRivZTMLs&feature=channel
http://www.youtube.com/ytscreeningroom?v=oTJRivZTMLs
http://www.youtube.com/embed/oTJRivZTMLs?rel=0
http://youtube.com/v/oTJRivZTMLs&feature=channel
http://youtube.com/v/oTJRivZTMLs&feature=channel
http://youtube.com/vi/oTJRivZTMLs&feature=channel
http://youtube.com/?v=oTJRivZTMLs&feature=channel
http://youtube.com/?feature=channel&v=oTJRivZTMLs
http://youtube.com/?vi=oTJRivZTMLs&feature=channel
http://youtube.com/watch?v=oTJRivZTMLs&feature=channel
http://youtube.com/watch?vi=oTJRivZTMLs&feature=channel

/^.*(youtu.be\/|v\/|e\/|u\/\w+\/|embed\/|v=)([^#\&\?]*).*/

测试:

http://www.youtube.com/v/0zM3nApSvMg?fs=1&hl=en_US&rel=0 http://www.youtube.com/embed/0zM3nApSvMg?rel=0 http://www.youtube.com/watch?v=0zM3nApSvMg&feature=feedrec_grec_index http://www.youtube.com/watch?v=0zM3nApSvMg http://youtu.be/0zM3nApSvMg http://www.youtube.com/watch?v=0zM3nApSvMg#t=0m10s http://www.youtube.com/user/IngridMichaelsonVEVO#p/a/u/1/KdwsulMb8EQ http://youtu.be/dQw4w9WgXcQ http://www.youtube.com/embed/dQw4w9WgXcQ http://www.youtube.com/v/dQw4w9WgXcQ http://www.youtube.com/e/dQw4w9WgXcQ http://www.youtube.com/watch?v=dQw4w9WgXcQ http://www.youtube.com/?v=dQw4w9WgXcQ http://www.youtube.com/watch?feature=player_embedded&v=dQw4w9WgXcQ http://www.youtube.com/?feature=player_embedded&v=dQw4w9WgXcQ http://www.youtube.com/user/IngridMichaelsonVEVO#p/u/11/KdwsulMb8EQ http://www.youtube-nocookie.com/v/6L3ZvIMwZFM?version=3&hl=en_US&rel=0

受到另一个答案的启发。

这个正则表达式匹配嵌入、共享和链接url。

const youTubeIdFromLink = (url) => url.match(/(?:https?:\/\/)?(?:www\.|m\.)?youtu(?:be)?\.(?:com|be)(?:\/watch\/?\?v=|\/embed\/|\/)([^\s&\?\/\#]+)/)[1];


console.log(youTubeIdFromLink('https://youtu.be/You-Tube_ID?rel=0&hl=en')); //You-Tube_ID

console.log(youTubeIdFromLink('https://www.youtube.com/embed/You-Tube_ID?rel=0&hl=en')); //You-Tube_ID

console.log(youTubeIdFromLink('https://m.youtube.com/watch?v=You-Tube_ID&rel=0&hl=en')); //You-Tube_ID

由于YouTube视频id被设置为11个字符，我们可以简单地在用v=分割url后使用子字符串。 那么我们就不依赖于最后的&号了。

var sampleUrl = "http://www.youtube.com/watch?v=JcjoGn6FLwI&asdasd";

var video_id = sampleUrl.split("v=")[1].substring(0, 11)

很好很简单:)

您不需要为此使用正则表达式。

var video_id = window.location.search.split('v=')[1];
var ampersandPosition = video_id.indexOf('&');
if(ampersandPosition != -1) {
  video_id = video_id.substring(0, ampersandPosition);
}

这里有一个红宝石版本:

def youtube_id(url)
   # Handles various YouTube URLs (youtube.com, youtube-nocookie.com, youtu.be), as well as embed links and urls with various parameters
   regex = /(?:youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|vi|e(?:mbed)?)\/|\S*?[?&]v=|\S*?[?&]vi=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/
   match = regex.match(url)
   if match && !match[1].nil?
      match[1]
   else
      nil
   end
end

测试方法:

example_urls = [
   'www.youtube-nocookie.com/embed/dQw4-9W_XcQ?rel=0',
   'http://www.youtube.com/user/Scobleizer#p/u/1/dQw4-9W_XcQ',
   'http://www.youtube.com/watch?v=dQw4-9W_XcQ&feature=channel',
   'http://www.youtube.com/watch?v=dQw4-9W_XcQ&playnext_from=TL&videos=osPknwzXEas&feature=sub',
   'http://www.youtube.com/ytscreeningroom?v=dQw4-9W_XcQ',
   'http://www.youtube.com/user/SilkRoadTheatre#p/a/u/2/dQw4-9W_XcQ',
   'http://youtu.be/dQw4-9W_XcQ',
   'http://www.youtube.com/watch?v=dQw4-9W_XcQ&feature=youtu.be',
   'http://youtu.be/dQw4-9W_XcQ',
   'http://www.youtube.com/user/Scobleizer#p/u/1/dQw4-9W_XcQ?rel=0',
   'http://www.youtube.com/watch?v=dQw4-9W_XcQ&playnext_from=TL&videos=dQw4-9W_XcQ&feature=sub',
   'http://www.youtube.com/ytscreeningroom?v=dQw4-9W_XcQ',
   'http://www.youtube.com/embed/dQw4-9W_XcQ?rel=0',
   'http://www.youtube.com/watch?v=dQw4-9W_XcQ',
   'http://youtube.com/v/dQw4-9W_XcQ?feature=youtube_gdata_player',
   'http://youtube.com/vi/dQw4-9W_XcQ?feature=youtube_gdata_player',
   'http://youtube.com/?v=dQw4-9W_XcQ&feature=youtube_gdata_player',
   'http://www.youtube.com/watch?v=dQw4-9W_XcQ&feature=youtube_gdata_player',
   'http://youtube.com/?vi=dQw4-9W_XcQ&feature=youtube_gdata_player',
   'http://youtube.com/watch?v=dQw4-9W_XcQ&feature=youtube_gdata_player',
   'http://youtube.com/watch?vi=dQw4-9W_XcQ&feature=youtube_gdata_player',
   'http://youtu.be/dQw4-9W_XcQ?feature=youtube_gdata_player'
]

# Test each one
example_urls.each do |url|
   raise 'Test failed!' unless youtube_id(url) == 'dQw4-9W_XcQ'
end

要查看此代码并在在线repl中运行测试，您也可以到这里: https://repl.it/@TomChapin/youtubeid