> I don't know what language your program is even written in!
I legitimately don't understand how you're in this situation. If the documentation is telling you that something is a regex, and it's not a user-supplied regex, then that's something intended for fellow developers. If configuration expects a regex for some reason, that's a signal that you're expected to be a programmer to use the software; and you're presumably interested in it because you use the same language, or are at least familiar enough with the open source ecosystem to look these things up. If the software were meant to be used by people who can't do these things, it would be designed without those rough edges, but more importantly the documentation would be getting written by a non-developer.