On Oct 3, 2017, at 01:41, Serhiy Storchaka <storch...@gmail.com> wrote: > > 03.10.17 06:29, INADA Naoki пише: >> More optimization can be done with implementing sre_parse and sre_compile in >> C. >> But I have no time for it in this year. > > And please don't do this! This would make maintaining the re module hard. The > performance of the compiler is less important than correctness and > performance of matching and searching.
What if the compiler could recognize constant arguments to re.compile() and do the regex compilation at that point? You’d need a way to represent the precompiled regex in the bytecode, and it would technically be a semantic change since regex problems would be discovered at compilation time instead of runtime - but that might be a good thing. You could also make that an optimization flag for opt-in, or a flag to allow opt out. -Barry
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