On the "other" test set, my approach fares far more within my expectations, but here the number of elements returned seems to become significant over the number of string joins:
Rate split1 substr1 map_split subst map_spl
+it_join using_str_bit_ops_and_tr
split1 1.74/s -- -94% -100% -100%
+ -100% -100%
substr1 30.5/s 1650% -- -93% -94%
+ -94% -96%
map_split 455/s 26002% 1392% -- -13%
+ -15% -34%
subst 520/s 29765% 1607% 14% --
+ -3% -25%
map_split_join 534/s 30577% 1653% 18% 3%
+ -- -23%
using_str_bit_ops_and_tr 692/s 39604% 2169% 52% 33%
+ 29% --
So, you will need to always benchmark with real data! ;)
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