Your question is very vague. It's not even clear what domain you're working in. Just for the interest of the other Monks, I'm going to guess that "emi" in your example file stands for electromagnetic interference, and that "ports/pins" are locations where you're applying and/or measuring some kind of test signal in a piece of hardware.

You talk about asterisks in your question, but your example doesn't contain any. Your other post was more understandable in that regard. But what if your waiver file contains these two lines:

c4*_123
c4a_*

If the input is c4a_123, which pattern should match? The first one? In that case, you need to remember the order of the waiver file, so you don't want to use a hash. See choroba's response to your original post.

In reply to Re: Wildcard in a hash by Anonymous Monk
in thread Grep asterisk sign in input file by DespacitoPerl

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