On 12/07/2010 15:07, Nick Coghlan wrote:
On Mon, Jul 12, 2010 at 9:42 AM, Steven D'Aprano<st...@pearwood.info> wrote:
On Sun, 11 Jul 2010 09:37:22 pm Eric Smith wrote:
re2 comparison is interesting from the point of if it should be
included in stdlib.
Is "it" re2 or regex? I don't see having 2 regular expression engines
in the stdlib.
There's precedence though... the old regex engine and the new re engine
were side-by-side for many years before regex was deprecated and
finally removed in 2.5. Hypothetically, re2 could similarly be added to
the standard library while re is deprecated.
re2 deliberately omits some features for efficiency reasons, hence is
not even on the table as a possible replacement for the standard
library version. If someone is in a position where re2 can solve their
problems with the re module, they should also be in a position where
they can track it down for themselves.
If it has *partial* compatibility, and big enough performance
improvements for common cases, it could perhaps be used where the regex
doesn't use unsupported features. This would have some extra cost in the
compile phase, but would mean Python could ship with two regex engines
but only one interface exposed to the programmer...
Michael
MRAB's module offers a superset of re's features rather than a subset
though, so once it has had more of a chance to bake on PyPI it may be
worth another look.
Cheers,
Nick.
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