[Python-Dev] Make re.compile faster (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Tue Oct 3 10:30:17 EDT 2017

On Tue, 3 Oct 2017 10:21:55 -0400 Barry Warsaw <barry at python.org> wrote:

On Oct 3, 2017, at 01:41, Serhiy Storchaka <storchaka at gmail.com> wrote: > > 03.10.17 06:29, INADA Naoki пише: >> More optimization can be done with implementing sreparse and srecompile 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.

We need a regex literal! With bytes, formatted, and bytes formatted variants.

Regards

Antoine.

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