simple mail splitting: matching two different headers

[Albert Reiner]

Hi,

I want to split all the mail to and from concerning address foo@bar
according to the presence of some tag in the subject.  So, e.g.,

  From: foo@bar
  Subject: Re: BAZ ...     should go to mail.foo-bar.baz, and

  Cc: foo@bar
  Subject: QUUX ...        to mail.foo-bar.quux, and

  To: foo@bar
  Subject: ...             to mail.foo-bar.

>From the info file it seems I need to replace the usual regular
expressions with elisp functions like

    (lambda (headers)
      (and (??? "^\\(To\\|From\\|Cc\\): .*foo@bar")
           (??? "^Subject: .* BAZ")))

where (??? regexp) returns true if regexp matches headers, just that I
don't know what to use for ???.  I'm sure this must be exceedingly
simple for those who know elisp.

Thanks in advance,

Albert.