CSV is pretty easy, start by googling for perl csv . There are many good modules but Text::CSV_XS is usually the choice most make. See csv handling in Perl for a good starting point. Once again, if you run into code problems, post a new node with CSV in the title, and try to provide a simple self-contained example.

By the way, you probably can do all your regexes and file filtering without using a temp file which you later need to unlink. BUT TIMTOWTDI ( there is more than one way to do it ) .... it's a Perl slogan. :-) If it is easy for you to work with, it's all good.