As described in I know what I mean. Why don't you?, come up with a simple, replicatable piece of code that displays the bug. For example, 
use strict;
use warnings;

my %result;
my %seq = (key => 'asdfasdfasdf');
my @string = 'asdf';

foreach my $string (@string) {
    chomp $string;
    foreach my $key (keys %seq) {
        $result{$string} =()= ($seq{$key} =~ /$string/ig); 
    }

    foreach my $s (keys %result) {
        print "$s => $result{$s}\n";
    }
}

[download]
outputs asdf => 3 as expected.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^7: counting the number of 16384 pattern matches in a large DNA sequence by kennethk
in thread counting the number of 16384 pattern matches in a large DNA sequence by anonym

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