I'm honestly lost as to what is available to me and how to negate a pattern and I've been using GNU/Linux for the last decade and have seen all sorts of hairy regexp patterns and can't make heads or tails what I can use here.
How about some links to manpages or regex patterns or some more examples or something?
Doc patch welcome.
Basically, the patterns are globs, not regular expressions. Whatever works on the command line to refer to files should work here. See also: https://github.com/isaacs/node-glob