@lemon-fox No idea! I don't use MUSHClient. You'd be looking for an option to highlight things based on a regex, which I'm very un-expert with. And I know there are different types of regexes? Or something? Like the Atlantis ones won't work in Potato? They have different engines or -- something. Someone told me the answer to this once.
Based on this page I found googling, you can indeed do regex highlights on MUSHClient, so you'd have to explore and figure it out.