RE: [FWP] counting in REs

["WORENKLEIN, David, GCM" <David.Worenklein@gcm.com>]

Hint: #3 is just as easy as #1 and #2.

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$string =~ /^[^a]*(a*)[^a]*\1[^a]*$/ && $string =~
/^[^b]*b[^b]*(b*)[^b]*\1[^b]*$/

-----Original Message-----
From: Rich Morin [mailto:rdm@cfcl.com]
Sent: Wednesday, September 08, 1999 11:27 AM
To: fwp@technofile.org
Subject: [FWP] counting in REs


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
--
Rich Morin:          rdm@cfcl.com, +1 650-873-7841, http://www.ptf.com/~rdm
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