Chromatic,
I would agree that this code in it's entirety needs to be brought up to speed as far as using hashes, packages and a more current style of scripting.
I don't see where using substitution adds instability or has a problem with accuracy, unless they change the ASCII value for the character '@'.
If I were the OP, and had a choice of re-writing this script, or fixing it for now and coming back to it later, I would code the fix and enjoy the Holiday's.
Sometimes, getting all fancy for such a little straight forward script is not worth the effort.
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