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Created on2015-07-07 01:25 bydhaffey, last changed2022-04-11 14:58 byadmin. This issue is nowclosed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| re_open_group_symbolic_ref.patch | serhiy.storchaka,2015-07-07 09:35 | review | ||
| re_open_group_symbolic_ref-3.4.patch | serhiy.storchaka,2015-07-07 09:37 | review | ||
| Messages (5) | |||
|---|---|---|---|
| msg246390 -(view) | Author: Dan Haffey (dhaffey) | Date: 2015-07-07 01:25 | |
Error reporting for recursive backreferences in regexes isn't consistent across both types of backref. Here's the exception for a recursive numeric backref:>>> import re>>> re.compile(r'(\1)')Traceback (most recent call last): ...sre_constants.error: cannot refer to an open group at position 1Here's what I'm seeing on the 3.5 branch for a named backref:>>> re.compile(r'(?P<spam>(?P=spam))')Traceback (most recent call last): ...RecursionError: maximum recursion depth exceededWhich is an improvement over 3.4 and below, where compilation succeeds and appears to treat (?P=spam) as valid but unmatchable. | |||
| msg246396 -(view) | Author: Serhiy Storchaka (serhiy.storchaka)* | Date: 2015-07-07 09:35 | |
Here is a patch that forbids symbolic references to opened groups in 3.5+. | |||
| msg246397 -(view) | Author: Serhiy Storchaka (serhiy.storchaka)* | Date: 2015-07-07 09:37 | |
It is questionable if an exception should be raised in older Python versions. Here is a patch for 3.4 that just issues a warning. | |||
| msg246913 -(view) | Author: Roundup Robot (python-dev) | Date: 2015-07-18 20:38 | |
New changeset361d7af9396e by Serhiy Storchaka in branch '3.5':Issue#24580: Symbolic group references to open group in re patterns now arehttps://hg.python.org/cpython/rev/361d7af9396eNew changeset4d3557500019 by Serhiy Storchaka in branch 'default':Issue#24580: Symbolic group references to open group in re patterns now arehttps://hg.python.org/cpython/rev/4d3557500019 | |||
| msg256740 -(view) | Author: Serhiy Storchaka (serhiy.storchaka)* | Date: 2015-12-19 21:26 | |
It is too late for 3.4, and I left 2.7 as is. Reopen issue if you think that it is worth to add a warning to 2.7. | |||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:18 | admin | set | github: 68768 |
| 2015-12-19 21:26:32 | serhiy.storchaka | set | status: open -> closed nosy: +benjamin.peterson messages: +msg256740 resolution: fixed stage: patch review -> resolved |
| 2015-07-18 20:38:14 | python-dev | set | nosy: +python-dev messages: +msg246913 |
| 2015-07-07 09:37:33 | serhiy.storchaka | set | versions: + Python 2.7, Python 3.4 |
| 2015-07-07 09:37:20 | serhiy.storchaka | set | files: +re_open_group_symbolic_ref-3.4.patch messages: +msg246397 |
| 2015-07-07 09:35:19 | serhiy.storchaka | set | files: +re_open_group_symbolic_ref.patch keywords: +patch messages: +msg246396 stage: needs patch -> patch review |
| 2015-07-07 04:31:20 | serhiy.storchaka | set | assignee:serhiy.storchaka stage: needs patch nosy: +serhiy.storchaka versions: + Python 3.5, Python 3.6 |
| 2015-07-07 01:25:41 | dhaffey | create | |