vaidate youtube url
function matchYoutubeUrl(url) {
var p = /^(?:https?:\/\/)?(?:m\.|www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/;
if(url.match(p)){
return url.match(p)[1];
}
return false;
}
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