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  1. or download this
    
if($action eq '!='){
                    $match{$a} = 0 if $line[$position]=~m/\Q$key/i;
                }
                else{$match{$a} = 1 if $line[$position]=~m/\Q$key/i;}
  2. or download this
    Can be rewritten like so: 
    $match{$a} = ($line[$position] =~ m/\b\Q$key\E\b/i) ? 1 : 0;
    $match{$a} = !$match{$a} if $action eq '!=';
  3. or download this
    
if($action eq '!='){
...
                }
                else{$match{$a} = !$match{$a} if $action eq '!=';}