I agree with this node. What I would additionally recommend you do is to start writing tests. That way, if you change one thing in the old code and it causes a bunch of stuff to fail, you can then consider inserting your favourite perl module as a "quick test", and if the perl code passes the test, (or if you can tinker with the orignal code to make it work, without causing other things to fail), you could be golden. Good luck!
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