Regexp notation

[Alan Bawden <Alan@lcs.mit.edu>]

   Date: 09 Jan 1997 15:22:56 -0500
   From: Olin Shivers <shivers@ai.mit.edu>
   ...  But when was the last time you thought to yourself "I'd like to
   match all the strings that *aren't* matched by regexp R," or "I'd like
   to match all the strings that match pattern R1 *and* pattern R2"?...

Yesterday.