Rate by_regex1 by_regex3     by_fh  by_index by_regex2
by_regex1 49.6/s        --      -52%      -75%      -81%      -83%
by_regex3  103/s      107%        --      -48%      -61%      -66%
by_fh      199/s      301%       94%        --      -25%      -34%
by_index   266/s      437%      160%       34%        --      -11%
by_regex2  300/s      505%      192%       51%       13%        --