I just opened a pull request to add a cleaned up version of '(chibi
regexp)' to the srfi repository.

https://github.com/scheme-requests-for-implementation/srfi-115/pull/3

Gerbil fails one last test so I'll have to either look into or report
it. It's even more surprising to me (in a good way) that Gauche's
implementation fails a couple too. Yay! Back to fixing bugs :P
--
Duy