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our $s = '123456789' x 100_000; cmpthese -1, { ... c=>q[ my ($a) = $s =~ m/(23)/g ], d=>q[ my ($a) = $s =~ m/(23)/; ], };
Rate a c d b a 7.65/s -- -34% -99% -99% c 11.7/s 52% -- -99% -99% d 1336/s 17371% 11358% -- -3% b 1380/s 17950% 11738% 3% --