Java代码:(适用于所有url:

http://www.youtube.com/watch?v=0zM3nApSvMg&feature=feedrec_grec_index http://www.youtube.com/user/IngridMichaelsonVEVO#p/a/u/1/QdK8U-VIH_o http://youtube.googleapis.com/v/0zM3nApSvMg?fs=1&hl=en_US&rel=0 http://www.youtube.com/watch?v=0zM3nApSvMg#t=0m10s http://www.youtube.com/embed/0zM3nApSvMg?rel=0” http://www.youtube.com/watch?v=0zM3nApSvMg http://youtu.be/0zM3nApSvMg http://www.youtube.com/watch?v=0zM3nApSvMg/ http://www.youtube.com/watch?feature=player_detailpage&v=8UVNT4wvIGY

)

    String url = "http://www.youtube.com/watch?v=0zM3nApSvMg&feature=feedrec_grec_index";

    String regExp = "/.*(?:youtu.be\\/|v\\/|u/\\w/|embed\\/|watch\\?.*&?v=)";
    Pattern compiledPattern = Pattern.compile(regExp);
    Matcher matcher = compiledPattern.matcher(url);
    if(matcher.find()){
        int start = matcher.end();
        System.out.println("ID : " + url.substring(start, start+11));

    }

DailyMotion网站:

String url = "http://www.dailymotion.com/video/x4xvnz_the-funny-crash-compilation_fun";

    String regExp = "/video/([^_]+)/?";
    Pattern compiledPattern = Pattern.compile(regExp);
    Matcher matcher = compiledPattern.matcher(url);
    if(matcher.find()){
        String match = matcher.group();
        System.out.println("ID : " + match.substring(match.lastIndexOf("/")+1));

    }

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);
}

强大的Python来了

import pytube

yt = pytube.YouTube("https://www.youtube.com/watch?v=kwM2ApskJy4")

video_id = yt.video_id

print("video id from utl..",video_id)

你可以点击共享按钮并复制缩短URL。 例如: 这个YouTube视频的网址是https://www.youtube.com/watch?v=3R0fzCw3amM 但如果你点击分享按钮并复制缩短URL，你会得到这个https://youtu.be/3R0fzCw3amM

这肯定需要regex:

复制到Ruby IRB:

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

查看所有测试用例:https://gist.github.com/blairanderson/b264a15a8faaac9c6318

我做了一个小函数，从Youtube url中提取视频id，如下所示。

var videoId =函数(url) { Var match = url.match(/v=([0-9a-z_-]{1,20})/i); 返回(match ?匹配['1']:false); }; console.log (videoId (' https://www.youtube.com/watch?v=dQw4w9WgXcQ ')); console.log (videoId (' https://www.youtube.com/watch?t=17s&v=dQw4w9WgXcQ ')); console.log (videoId (' https://www.youtube.com/watch?v=dQw4w9WgXcQ&t=17s '));

这个函数将提取视频id，即使url中有多个参数。