Change the map line to my %hash = map { fc $_, 1 } @castaways;, so that the hash keys are already folded, and I get:
John is a castaway
JANE is a castaway
luke is a castaway

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In reply to Re^4: Can we make hash key check in 'if' condition case insensitive? by pryrt
in thread [SOLVED: Can we make hash key check in 'if' condition case insensitive? by Perl300

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