Ruby regexp and XEmacs font-locking

Font-lock works fine with most of rRuby on XEmacs, but regular
expressions are ignored. I’ve searched the archives for an answer, but
nothing I found seemed relevant.

I’d like regular expressions to be highlighted like strings are, though
a different color. I’m afraid I don’t know enough Elisp to figure the
relevant part of the ruby-mode.el.

Is there a patch for this already existing, or is this something I’ll
have to devote hours or days to figuring out and solving?

Thanks,
Larry