Alright, thanks all!

I've already thought of using "character-by-character parser" as dragonchild suggested, but I guess Perl scripts are just less sexy when you have to use techniques too common for other languages ;) . Just kidding; the truth is, as this is meant to be a really simple script (for personal use), regex seemed to be a good option: short and, well, usually simple. Of course, I'd choose char-by-char parsing over using overly-complicated regular expressions, so, anyway, thanks again.