I was going to include the code, but it is 60K long. You can pick up folding.el here

It will take your source code and replace each bracketed section with a marker. You use the navigation commands on the folding mode to move in and out of "folds".

It worked for me on my C code fine. I haven't used it with Perl, but given that the same character is used for delimited code blocks, there is a good chance.

It is not a standard part of GNU Emacs (even though my Landmark Learning Neural Network is --- just type meta-x lm-test-run on any GNU Emacs!).

If you still get no help, take a look through the archives of gnu.emacs.sources or post to gnu.emacs.help or look through The Emacs Lisp Archive