Oh, d'oh, I'm silly. I meant to add 'aeiou' to the character
class, I really did, since that was the whole reason I
introduced it. :) And I'm sorry I hadn't checked vroom's
specs.
By the way, since Pig Latin does not produce a 1-to-1 mapping
of normal strings to PL-strings, you can't reasonably reverse
this process. Example: flea and leaf both go to eaflay.