String length: 2400 Rate split_tr_join unpack_pack rindex_substr reverse_regex split_tr_join 880/s -- -62% -99% -99% unpack_pack 2337/s 166% -- -98% -99% rindex_substr 146161/s 16513% 6155% -- -11% reverse_regex 163840/s 18522% 6912% 12% --