in reply to Re^2: hash questionin thread hash question
%a = ( A => 1, ); print 'A' if not exists $a{'A'}; # prints nothing print 'B' if not exists $a{'B'}; # prints B [download]
Try use warnings; to see if you're trying to print undef, and like pg suggested, make sure the // actually matched. You could also give us a sample of IN and IN2 which doesn't provide the expected output.