Hi, Anonymous -

I understand you want to check case-insensitively which keys in hash2 are also keys of hash1. The following solution might be a good option for large hashes as it only involves one loop: 
my $string = join " ", keys %hash1;

foreach my $item ( keys( %hash2 ) ) 
{
     print "$item matches" if ( $string =~ /\b$item\b/i );
}

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In reply to Re: Comparing two hashes for duplicate keys with no case sensitivity by pat_mc
in thread Comparing two hashes for duplicate keys with no case sensitivity by Anonymous Monk

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