To do a fast key lookup, the strings have to be equal, so the short answer is NO.
You can lowercase the keys of the hash, but you can store the original string as the value if you need it later:
#!/usr/bin/perl
use warnings;
use strict;
my @castaways = qw( john Jane LUKE );
my @list_1 = qw( not John JANE luke );
my %hash = map { lc, $_ } @castaways;
for my $person (@list_1) {
if (exists $hash{ lc $person }) {
print "$person is a castaway (as $hash{ lc $person }).\n";
}
}
I used exists so even 0 can be a castaway.
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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