videoId = videoUrl.split('v=')[1].substring(0,11);

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

我有一个正则表达式，支持常用的url，其中还包括YouTube短片

正则表达式模式:

(youtu *。*)\ /(看\ ? v = |嵌入\ / | |短裤 |)(.*?((?=[&#?])|$))

Javascript返回方法:

function getId(url) {
  let regex = /(youtu.*be.*)\/(watch\?v=|embed\/|v|shorts|)(.*?((?=[&#?])|$))/gm;
  return regex.exec(url)[3];
}

支持的URL类型:

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://www.youtube.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
https://youtube.com/shorts/0dPkkQeRwTI?feature=share
https://youtube.com/shorts/0dPkkQeRwTI

与测试:

https://regex101.com/r/5JhmpW/1

简单的正则表达式，如果你有完整的URL，保持简单。

results = url.match("v=([a-zA-Z0-9]+)&?")
videoId = results[1] // watch you need.

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

我把Lasnv的回答简化了一点。

它还修复了WebDeb描述的错误。

下面就是:

var regExp = /^.*(youtu\.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
var match = url.match(regExp);
if (match && match[2].length == 11) {
  return match[2];
} else {
  //error
}

下面是一个regexer链接: http://regexr.com/3dnqv