简化Jacob Relkin的回答，你所需要做的就是:

const extractVideoIdFromYoutubeLink = youtubeLink => {
    return youtubeLink.split( 'v=' )[1].split( '&' )[0];
};

var video_url = document.getElementById('youtubediv').value;
        if(video_url!=""){
        ytid(video_url);
        document.getElementById("youtube").setAttribute("src","http://www.youtube.com/embed/"+ytid(video_url));
        }
        function ytid(video_url){
            var video_id = video_url.split('v=')[1];
            var ampersandPosition = video_id.indexOf('&');
            if(ampersandPosition != -1) {
                video_id = video_id.substring(0, ampersandPosition);
            }
            return video_id;
        }

我希望它能有所帮助

截至2015年1月1日，这些都不能在厨房里工作，特别是没有http/s协议和youtube-nocookie域的url。这里有一个修改过的版本，适用于所有这些不同的Youtube版本:

// Just the regex. Output is in [1]. /^.*(?:(?:youtu\.be\/|v\/|vi\/|u\/\w\/|embed\/|shorts\/)|(?:(?:watch)?\?v(?:i)?=|\&v(?:i)?=))([^#\&\?]*).*/ // For testing. var urls = [ 'https://youtube.com/shorts/dQw4w9WgXcQ?feature=share', '//www.youtube-nocookie.com/embed/up_lNV-yoK4?rel=0', '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', '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?rel=0', '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', 'http://www.youtube.com/embed/nas1rJpm7wY?rel=0', 'http://www.youtube.com/watch?v=peFZbP64dsU', 'http://youtube.com/v/dQw4w9WgXcQ?feature=youtube_gdata_player', 'http://youtube.com/vi/dQw4w9WgXcQ?feature=youtube_gdata_player', 'http://youtube.com/?v=dQw4w9WgXcQ&feature=youtube_gdata_player', 'http://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtube_gdata_player', 'http://youtube.com/?vi=dQw4w9WgXcQ&feature=youtube_gdata_player', 'http://youtube.com/watch?v=dQw4w9WgXcQ&feature=youtube_gdata_player', 'http://youtube.com/watch?vi=dQw4w9WgXcQ&feature=youtube_gdata_player', 'http://youtu.be/dQw4w9WgXcQ?feature=youtube_gdata_player' ]; var i, r, rx = /^.*(?:(?:youtu\.be\/|v\/|vi\/|u\/\w\/|embed\/|shorts\/)|(?:(?:watch)?\?v(?:i)?=|\&v(?:i)?=))([^#\&\?]*).*/; for (i = 0; i < urls.length; ++i) { r = urls[i].match(rx); console.log(r[1]); }

好吧，简单解析的方法是:从第一个=符号开始到第一个&符号。

我想他们在这里有一个类似的答案:

使用JavaScript解析Vimeo ID ?

Python3版本:

import re

def get_youtube_id(url):
   match = re.match('^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))?\?v?=?(?P<id>\w*).*', url);
   return match.group('id')

如果你想在shell/bash/zsh/fish脚本中包含它，下面是如何做到的:

echo -n "$YOUTUBE_URL" | python -c "import re; import sys; m = re.match('^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))?\?v?=?(?P<id>\w*).*', sys.stdin.read()); sys.stdout.write(m.group('id'))"

例子:

echo -n "https://www.youtube.com/watch/?v=APYVWYHS654" | python -c "import re; import sys; m = re.match('^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))?\?v?=?(?P<id>\w*).*', sys.stdin.read()); sys.stdout.write(m.group('id'))"  

APYVWYHS654

你可以使用下面的代码从URL中获取YouTube视频ID:

url = "https://www.youtube.com/watch?v=qeMFqkcPYcg"
VID_REGEX = /(?:youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/
alert(url.match(VID_REGEX)[1]);