How to disable external links in wysiwyg editor?

Question

JavaScript

Is there a ready-made solution for disabling external links in the wysiwyg editor for a site?
If not, how can such functionality be implemented?

Answer 1

When saving the text, we run it with a regular expression and look for links.

Answer 2

I also thought about regular expressions... But the question is different, external links "pump" your resource...