Good point! I just wanted to compare equivalent substitutions.
Adding testC:
'testC' => sub { my $f = $test; $f =~ s/\s+,/,/g; $f =~ s/,\s+/,/g;
+},
100_000:
Rate test1 test2 test3 testA testC testB
test1 6.5/s -- -28% -66% -76% -80% -81%
test2 9.0/s 39% -- -53% -67% -73% -73%
test3 19.1/s 196% 113% -- -29% -42% -43%
testA 27.0/s 318% 201% 41% -- -18% -19%
testC 33.1/s 412% 269% 73% 23% -- -1%
testB 33.3/s 416% 272% 74% 23% 1% --
C is 23% faster than A, even running twice over some of the commas in the test string. B doesn't touch a comma twice, but is only 1% faster than C.
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