Extract video id from youtube URL with javascript function 

function youtube_parser(url){
    var regExp = /^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))\??v?=?([^#\&\?]*).*/;
    var match = url.match(regExp);
    if (match&&match[7].length==11) { return match[7]}
  
  var regExp2 = /^.*(youtu\.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
  var match2 = url.match(regExp2);
  if (match2 && match2[2].length == 11) {
    return match2[2];
  }
  
  var regex = /(?:[?&]v=|\/embed\/|\/1\/|\/v\/|https?:\/\/(?:www\.)?youtu\.be\/)([^&\n?#]+)/gm;
  let m = regex.exec(url);
  if (m[1].length){
    return m[1];
  }
  
  return url+' --failed--';
}
console.clear()
var n = [
  'http://www.youtube.com/watch?v=0zMd3nApSvMg&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=0zMg3nApSvMg#t=0m10s',
  'http://www.youtube.com/embed/0zM3nApdSvMg?rel=0',
  'http://www.youtube.com/watch?v=0zM3nAxpSvMg',
  'http://youtu.be/0zM3nApgSvMg'
];
  n.forEach(function(i){
  document.write(youtube_parser(i)+'<br>')
});
demo

See the Pen Youtube URL Parser by dimas lanjaka (@dimaslanjaka) on CodePen.