Sounds like you need something like this:
$parts[$index{Name}] =~  tr/A-Za-z/B-Wzb-w/ if defined ($index{Name});

[download]
Checking whether or not the hash key is defined or exists is faster and more clear than running a regex to see if it contains a digit.

Perhaps you need something similar to this on other replacements also?

In reply to Re^2: Parsing Header Last Field by Marshall
in thread Parsing Header Last Field by Anonymous Monk

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