note ctilmes Or just store the original key as the value of the canonicalized (lower-cased) hash. Look up in the lower case hash to find the key, then use the value of that hash to look up the value in the original hash. <code> #! /usr/bin/perl %hash1 = ("John", 43, "Paul", 25, "Marie", 22); %hash2 = ("john", 43, "Paul", 25, "marie", 22); my %lc_hash1 = map { lc $_ => $_ } keys %hash1; while (($KEY_2, $VALUE_2) = each %hash2){ if (exists $lc_hash1{lc $KEY_2}){ print "$KEY_2 : Matched\n"; print "Keys are: $lc_hash1{lc $KEY_2}, $KEY_2\n"; print "Values are: $hash1{$lc_hash1{lc $KEY_2}}, $VALUE_2\n"; } else{ print "$KEY_2 : Did not match\n"; } } </code> 871532 871550