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my %cache = ('-1' => qr/([^\(\)]+)\)+\Z/);

...
  $str =~ $cache{$level};
  return $1;
}

             Rate   Fatvamp       gjb      bobn Aristotle
Fatvamp   21155/s        --      -14%      -17%      -28%
gjb       24631/s       16%        --       -3%      -16%
bobn      25523/s       21%        4%        --      -13%
Aristotle 29497/s       39%       20%       16%        --