Google / Super Search is your friend, just a selection:

The only thing I have to add at the moment is that as of Perl 5.16 in addition to lc there is fc which might be useful if you have Unicode data. (Update: Didn't see Your Mother's post before posting.)

In reply to Re: Case insensitive hash key existance by haukex
in thread Case insensitive hash key existance by merrymonk

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