If you google for "CSV regexp" you get a lot of hits.  This one looks promising:

http://www.codeguru.com/columns/DotNetTips/article.php/c8153/

Warren Seltzer


-----Original Message-----
From: James Edward Gray II [mailto:james / grayproductions.net] 
Sent: Sunday, October 30, 2005 2:27 AM
To: ruby-talk ML
Subject: Regexp Guru Needed
...