[issue9134] sre bug: lastmark_save/restore

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Fixed in issue35859 together with other bugs, but the fix was only applied to 
3.11, because that bug is old and the old behavior matches the behavior in some 
other engines (Perl and Java).

--
resolution:  -> out of date
stage: needs patch -> resolved
status: open -> closed
versions: +Python 3.11 -Python 2.7, Python 3.7, Python 3.8

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[issue9134] sre bug: lastmark_save/restore

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
nosy: +Ma Lin
versions: +Python 3.8 -Python 3.6

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[issue9134] sre bug: lastmark_save/restore

[Armin Rigo]

Change by Armin Rigo :


--
nosy:  -arigo

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[issue9134] sre bug: lastmark_save/restore

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +xtreak

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[issue9134] sre bug: lastmark_save/restore

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
assignee:  -> serhiy.storchaka
versions: +Python 3.6, Python 3.7 -Python 3.4, Python 3.5

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[issue9134] sre bug: lastmark_save/restore

[Evgeny Kapun]

Changes by Evgeny Kapun abacabadabac...@gmail.com:


--
nosy: +abacabadabacaba

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[issue9134] sre bug: lastmark_save/restore

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It looks as the nature of this bug is clear to you, Armin. Do you want to write 
a patch?

--
nosy: +serhiy.storchaka
stage: test needed - needs patch
versions: +Python 3.5 -Python 3.3

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[issue9134] sre bug: lastmark_save/restore

[Armin Rigo]

Armin Rigo added the comment:

It was clear to me four years ago.  Now I'd have to dig again as much as you do.

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[issue9134] sre bug: lastmark_save/restore

[Georg Brandl]

Changes by Georg Brandl ge...@python.org:


--
versions: +Python 3.3, Python 3.4

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[issue9134] sre bug: lastmark_save/restore

[Armin Rigo]

Armin Rigo ar...@users.sourceforge.net added the comment:

It's pretty trivial to turn my x.py into a unit test, of course.

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[issue9134] sre bug: lastmark_save/restore

[Armin Rigo]

New submission from Armin Rigo ar...@users.sourceforge.net:

The re module is buggy is rare cases; see attached example script.

The bug is caused by the macros LASTMARK_SAVE and LASTMARK_RESTORE which are 
sometimes used without the extra code that does if (state-repeat) 
{mark_save()/mark_restore()}.

The bug appears by mis-reporting the position of groups within a repeated match 
(with * or +), notably the position of some groups that matched in older 
repetitions but (after some backtracking) not in newer ones.

--
components: Extension Modules
files: x.py
messages: 109019
nosy: arigo
priority: normal
severity: normal
status: open
title: sre bug: lastmark_save/restore
versions: Python 2.7
Added file: http://bugs.python.org/file17822/x.py

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[issue9134] sre bug: lastmark_save/restore

[Ezio Melotti]

Changes by Ezio Melotti ezio.melo...@gmail.com:


--
components: +Regular Expressions
nosy: +ezio.melotti
stage:  - unit test needed
type:  - behavior

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