horrid rx does not match string
       Rate   //   qr qr/o   /o
//   44.4/s   -- -29% -29% -32%
qr   62.7/s  41%   --  -1%  -4%
qr/o 63.0/s  42%   1%   --  -4%
/o   65.4/s  47%   4%   4%   --