[issue47248] Possible slowdown of regex searching in 3.11

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

Could you give the two versions? I will do a git bisect.

I tested 356997c~1 and 356997c [1], msvc2022 non-pgo release build:

# regex_dna ###
an +- std dev: 151 ms +- 1 ms -> 152 ms +- 1 ms: 1.01x slower
t significant

# regex_effbot ###
an +- std dev: 2.47 ms +- 0.01 ms -> 2.46 ms +- 0.02 ms: 1.00x faster
t significant

# regex_v8 ###
an +- std dev: 21.7 ms +- 0.1 ms -> 22.4 ms +- 0.1 ms: 1.03x slower
gnificant (t=-30.82)

https://github.com/python/cpython/commit/356997cccc21a3391175d20e9ef03d434675b496

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nosy: +malin

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<https://bugs.python.org/issue47248>
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