>> but I must admit that I have become very fond of Parse::RecDescent
Wow... that looks. complicated... I'm sure if I study the manual long enough I can figure it out. Looks fairly powerful though. Thanks for the link.
>> Furthermore, you can find an EBNF grammar-description for the Sudoers file here: http://www.sudo.ws/sudoers.man.html.
You know... when I first started on this project, I found that page but had no idea what an EBNF was. Thanks for pointing that out again, it certainly does help me define my rules.