I was doing some parsing in a similar domain the other year. I was parsing a file of info from which I wanted to create a dhcpd.conf file =)

I found Parse::RecDescent to be an excellent parser. I thoroughly recommend it. It may not be the swiftest module on the block, but it's certainly one of the most powerful (well, until Damian releases his perl6-style parser). I found the speed acceptable since changing my conf wasn't something I did every month.

-- Iain, aka Spoon.