detect youtube link in text and convert it to embed

function convert(text){
    var regExp = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
    var match = text.match(regExp);

    if (match && match[2].length == 11) {
        return `<iframe width="420" height="315" src="https://www.youtube.com/embed/${match[2]}" frameborder="0" allowfullscreen></iframe>`;
    } else {
        return 'no youtube link found';
    }
}