how to find the whole src for a youtube video code example

Example 1: HOW TO USE A video on a html website from youtube

<iframe width="560" height="315" src="https://www.youtube.com/embed/thatthingonvideourl" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Example 2: get youtube embed code from url

<----------------------------------- HTML ---------------------------------->
YouTube ID: <span id="myId"></span>
<br />
<br />
Embed code: <pre id="myCode"></pre>

function getId(url) {
    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 {
        return 'error';
    }
}
<----------------------------------- JS ---------------------------------->
var myId = getId('http://www.youtube.com/watch?v=zbYf5_S7oJo');

$('#myId').html(myId);

$('#myCode').html('<iframe width="560" height="315" src="//www.youtube.com/embed/' + myId + '" frameborder="0" allowfullscreen></iframe>');