9 Feb 2013:

A regular crossword  also: games

22 Aug 2009:

Humane email validation  also: ui, email

19 Nov 2008:

Pathological backtracking  also: python

19 Apr 2008:

Separating sentences  also: language, python, site, django

10 Aug 2007:

Regular expression diversity

7 Jan 2006:

Email validation again  also: php, email

14 Aug 2005:

Valid email addresses?  also: email

16 Sep 2003:

Reversing regular expressions  also: hacks

10 Apr 2003:

Verbose Python regular expressions  also: python