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exists can only do case sensitive comparisons. Instead of doing exists, extract the keys from both hashes using keys, and then lower case them both before comparison:

Note: this solution preserves the case in both hashes by storing keys in a temporary third hash.

# make temporary hash using lower case keys only # hash allows for fast lookup of matching key later on in # our for loop my %hashLowercaseKeys1 = ( map { lc($_) => 1 } keys %hash1 ); foreach my $k (keys %hash2) { if (exists $hashLowercaseKeys1{lc($k)}) { print "$k: matched\n"; } else { print "$k: no match\n"; } }

In reply to Re: Ignore Case when comparing Hash Keys by ELISHEVA
in thread Ignore Case when comparing Hash Keys by avidcoder

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