[racket] can racket have a regexp-equal?

yeah, i just looked at the logs and i see reference to this exact thing
several days before i even asked.  you devs are scary good!

On Sat, Nov 26, 2011 at 18:06, Robby Findler <robby at eecs.northwestern.edu>wrote:

> Oh, sorry-- it was changed before you sent your message. :)
>
> Robby
>
> On Sat, Nov 26, 2011 at 5:05 PM, ozzloy <ozzloy at gmail.com> wrote:
> > wow, that was really fast.  thanks!
> >
> > On Sat, Nov 26, 2011 at 09:37, Robby Findler <
> robby at eecs.northwestern.edu>
> > wrote:
> >>
> >> This has been changed in the current pre-release version, available
> >> from git and via a nightly build:
> >>
> >>  http://pre.racket-lang.org/installers/
> >>
> >> Robby
> >>
> >> On Fri, Nov 25, 2011 at 3:22 PM, ozzloy <ozzloy at gmail.com> wrote:
> >> > i was writing a unit test which had something analogous to the
> >> > following:
> >> > (check-equal? #rx"a" #rx"a")  => raises exn:test:check
> >> > so i checked and sure enough:
> >> > (equal? #rx"a" #rx"a) => #f
> >> > which led me to look for a regexp-equal? so i could do (check
> >> > regexp-equal?
> >> > #rx"a" #rx"a")
> >> > that doesn't exist, so i wrote one:
> >> > (define (regexp-equal? a b)
> >> >   (and (and (regexp? a)
> >> >             (regexp? b))
> >> >        (or (and (pregexp? a)
> >> >                 (pregexp? b))
> >> >            (and (not (pregexp? a))
> >> >                 (not (pregexp? b))))
> >> >        (equal? (object-name a)
> >> >                (object-name b))))
> >> > why not just have (equal? #rx"a" #rx"a") => #t ?
> >> > anticipated objection: "what should equal? mean for two regexps?"
> >> > it should mean that the patterns are identical, totally ignoring that
> >> > two
> >> > non-identical patterns might match exactly the same set, like
> #rx"(a|b)"
> >> > and
> >> > #rx"(b|a)".
> >> > i see in the docs that there is an internal regexp value.  if those
> are
> >> > what
> >> > i think they are, i propose equal? just compares those for regexes.
> >> >
> >> > _________________________________________________
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> >> >
> >
> >
>
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