Janet's 'spork' module is kinda like their libc, and has a regex submodule; it's very likely to be installed.

Janet is my first exposure to PEGs, so nothing to compare against but I love how powerful and easy they are. I have a better grasp of them in only a few months than dabbling over 20yrs with regex.

Also there is quite a bit of The Good Place callbacks within the Janet community; numerous 3rd party modules are named after characters, for example.