Let’s say that instead of looking at the ID, I want to select all a.href elements that contain (a piece of) this example: if document.url is "www.youtube.com".
var youtubeID = document.querySelectorAll('.youtubelink');
var youtubeDiv = document.querySelectorAll('a[href^="http://www.youtube.com"]');
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You can use * wildcard which matches any attribute value where https://www.youtube.com appears anywhere in the string.
Use this selector
a[href*="https://www.youtube.com"]
var youtubeDiv = document.querySelectorAll('a[href*="https://www.youtube.com"]');
console.log(youtubeDiv.length);<a href="https://www.youtube.com/sfdsfdsfsd">Link 1</a>
<a href="https://example.com?link=https://www.youtube.com/sfdsfdsfsd">Link 2</a>