You haven't shown us what you have tried so far, nor what your criteria for "best" are (fastest, least memory, simplest, etc). We cannot easily help you if you don't do your homework first.
From what you've given us, I'd egrep -v the data from the command line and skip perl altogether ...
The intelligent reader will judge for himself. Without examining the facts fully and fairly, there is no way of knowing whether vox populi is really vox dei, or merely vox asinorum. — Cyrus H. Gordon
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