[FWP] counting in REs

[Rich Morin <rdm@cfcl.com>]

A friend of mine recently presented me with three cases to match with
a regular expression:

   1)  test for an even number of 'a's in a string

   2)  test for an odd  number of 'b's in a string

   3)  test for an even number of 'a's
       and      an odd  number of 'b's in a string

Tasks 1 and 2 are pretty easy.  Task 3, however, is rather tricky.  I
will post some possible approaches in a followup...

-r
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