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6 Commits

Author SHA1 Message Date
Serhiy Storchaka 8ac2085b80
gh-109631: Allow interruption of short repeated regex matches (GH-109867) 
Counting for signal checking now continues in new match from the point where
it ended in the previous match instead of starting from 0.
 2023-09-26 10:56:33 +03:00
Serhiy Storchaka b305c69d10
gh-106508: Improve debugging of the _sre module (GH-106509) 
Now the VERBOSE macro can control tracing on per-pattern basis:

* 0 -- disabled
* 1 -- only if the DEBUG flag set
* 2 -- always
 2023-07-08 18:00:39 +03:00
Serhiy Storchaka 75a6fadf36
gh-91524: Speed up the regular expression substitution (#91525) 
Functions re.sub() and re.subn() and corresponding re.Pattern methods
are now 2-3 times faster for replacement strings containing group references.

Closes #91524

Primarily authored by serhiy-storchaka Serhiy Storchaka
Minor-cleanups-by: Gregory P. Smith [Google] <greg@krypto.org>
 2022-10-23 15:57:30 -07:00
Gregory P. Smith 4beee0c7b0
gh-91404: Revert "bpo-23689: re module, fix memory leak when a match is terminated by a signal or allocation failure (GH-32283) (#93882) 
Revert "bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure (GH-32283)"

This reverts commit 6e3eee5c11.

Manual fixups to increase the MAGIC number and to handle conflicts with
a couple of changes that landed after that.

Thanks for reviews by Ma Lin and Serhiy Storchaka.
 2022-06-17 01:19:44 -07:00
Ma Lin a29f858124
bpo-47256: Increasing the depth of backtracking in RE (GH-32411) 
Limit the maximum capturing group to 2**30-1 on 64-bit platforms
(it was 2**31-1). No change on 32-bit platforms (2**28-1).

It allows to reduce the size of SRE(match_context):
- On 32 bit platform: 36 bytes, no change.  (msvc2022)
- On 64 bit platform: 72 bytes -> 56 bytes. (msvc2022/gcc9.4)

which leads to increasing the depth of backtracking.
 2022-04-18 16:50:40 +03:00
Serhiy Storchaka 1578f06c1c
bpo-47152: Move sources of the _sre module into a subdirectory (GH-32290) 2022-04-04 10:53:26 +03:00