Ok, I've debugged the two reasons why my code wasn't working.

Forgive my newbiness, and I hope this helps someone else!

First of all, the options aren't included unless you place them before the main script. So, that's why my regex's weren't registering. that's probably a common thing here with unix commands, but as I said, I'm a noob, but I'm always learning!

Second of all, you have to escape your regular expression on the command line.

So, if you want to only include certain files or directories, you need do do a negative lookahead and escape the regular expression.

So, say you only wanted files with the word jacket or cake in the file. You could do that like this:

--hidden=^\(?\!\(.*jacket.*\)\|\(.*cake.*\)\)

If you just wanted files with the word jacket in them, you could do this:

--hidden=^\(?\!.*cake.*\)

Hope this helps someone else too!

A simpler way how to escape the regular expression argument is to use single quotes:

--hidden='^(?!.*cake.*)'

@zwhitchcox , can this issue to be closed?

No activity by long time. Feel free to reopen it, if issue doesn't solved.