open(FMT, "./formats/$filters_file") || die "Can't open $filters_file.\n";
    while(<FMT>) {
        chomp;
        next if /^\*/; #comments line

        $var_name = substr($_,2,5);
        $var      = substr($_,53);
        $var      =~ s/\s+$//g;
        $var_name =~ s/(\$)|(\s+$)//g;

        if ( exists $filters{$var_name} ) {
            push @{ $filters{$var_name} }, $var;
        } else {
            $filters{$var_name} = [ $var ];
        }
    }
    close FMT;
    return %filters;