Do you use "in production"? Is it OK?
By the way, Find seems to be only working on three or more characters? How do I find two-letter substring? :)
edit: Regexp find is a bit slow overall (one 5-line file). Like it is waiting for a while before commiting to updating the UI. And that's on an i7 desktop, can't imagine it working on my Celeron laptop (but will give it a try later).