Rate         OP while_shift     regex      ike2 chromatic      ike1
OP          117/s         --        -22%      -28%      -42%      -52%      -54%
while_shift 151/s        29%          --       -7%      -25%      -38%      -41%
regex       163/s        39%          8%        --      -19%      -33%      -36%
ike2        202/s        72%         33%       24%        --      -18%      -21%
chromatic   244/s       109%         62%       50%       21%        --       -4%
ike1        254/s       117%         68%       56%       26%        4%        --