# string length 2 * 10:
                 Rate     reverse       regex  substr_mod susbtr_copy
reverse      797484/s          --        -29%        -30%        -41%
regex       1125463/s         41%          --         -1%        -16%
substr_mod  1131927/s         42%          1%          --        -16%
susbtr_copy 1344489/s         69%         19%         19%          --


# string length 2 * 100_000:
              Rate     reverse susbtr_copy       regex  substr_mod
reverse     1385/s          --        -51%        -60%        -80%
susbtr_copy 2847/s        106%          --        -17%        -58%
regex       3437/s        148%         21%          --        -49%
substr_mod  6771/s        389%        138%         97%          --

# with 2 * 1e7:
              Rate     reverse susbtr_copy       regex  substr_mod
reverse     8.61/s          --        -54%        -58%        -81%
susbtr_copy 18.7/s        117%          --         -8%        -58%
regex       20.4/s        137%          9%          --        -54%
substr_mod  44.6/s        418%        139%        119%          --