SRE: (?flag:...) is not supported

[effbot]

BPO	433028
Nosy	@ezio-melotti, @serhiy-storchaka
Dependencies	bpo-22364: Improve some re error messages using regex for hints
Files	re_scoped_flags.diff re_scoped_flags_2.patch re_scoped_flags_3.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2016-09-11.08:06:42.309>
created_at = <Date 2001-06-14.08:28:31.000>
labels = ['expert-regex', 'type-feature']
title = 'SRE: (?flag:...) is not supported'
updated_at = <Date 2016-09-11.08:06:42.308>
user = 'https://bugs.python.org/effbot'

bugs.python.org fields:

activity = <Date 2016-09-11.08:06:42.308>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2016-09-11.08:06:42.309>
closer = 'serhiy.storchaka'
components = ['Regular Expressions']
creation = <Date 2001-06-14.08:28:31.000>
creator = 'effbot'
dependencies = ['22364']
files = ['38296', '38693', '44439']
hgrepos = []
issue_num = 433028
keywords = ['patch']
message_count = 8.0
messages = ['53162', '73687', '230849', '237026', '239281', '274817', '275467', '275742']
nosy_count = 6.0
nosy_names = ['effbot', 'timehorse', 'ezio.melotti', 'mrabarnett', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue433028'
versions = ['Python 3.6']

[effbot]

from the jeffrey friedl report:

(?flag:...) and (?-flag:...) are not supported.
They'd be nice.

[mrabarnett]

Implemented in bpo-3825.

[serhiy-storchaka]

I agree that they'd be nice. The regex module is too advanced and need much work and some transitional period for including in the stdlib, but this feature can be implemented right now.

[serhiy-storchaka]

Here is preliminary patch.

[serhiy-storchaka]

Updated to the tip.

Could anyone please help with documentation?

[serhiy-storchaka]

Fixed generating info for fast search for groups with local flags and added some documentation (would appreciate for improving it).

[python-dev]

New changeset ce5a834978ac by Serhiy Storchaka in branch 'default':
Issue bpo-433028: Added support of modifier spans in regular expressions.
https://hg.python.org/cpython/rev/ce5a834978ac

[serhiy-storchaka]

There was one bug (bpo-28070), it is now fixed.