[issue13219] re module doc has minor inaccuracy in character sets
Roundup Robot devn...@psf.upfronthosting.co.za added the comment: New changeset 07eca800cdb4 by Ezio Melotti in branch '2.7': #13219: clarify section about character sets in the re documentation. http://hg.python.org/cpython/rev/07eca800cdb4 New changeset dc96a89ac192 by Ezio Melotti in branch '3.2': #13219: clarify section about character sets in the re documentation. http://hg.python.org/cpython/rev/dc96a89ac192 New changeset 78540d1264d9 by Ezio Melotti in branch 'default': #13219: merge with 3.2. http://hg.python.org/cpython/rev/78540d1264d9 -- nosy: +python-dev ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13219 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13219] re module doc has minor inaccuracy in character sets
Ezio Melotti ezio.melo...@gmail.com added the comment: Done, thanks for the report! -- resolution: - fixed stage: commit review - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13219 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13219] re module doc has minor inaccuracy in character sets
Florent Xicluna florent.xicl...@gmail.com added the comment:
Well, the actual behavior is a little bit more complex to describe.
re.match('[.-_a-z]', '-')
re.match('[._-a-z]', '-')
_sre.SRE_Match object at 0x100418e80
re.match('[.-_a-z]', 'b')
_sre.SRE_Match object at 0x100418b88
re.match('[._-a-z]', 'b')
However, I don't think it is worth changing again the documentation.
--
nosy: +flox
type: - behavior
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[issue13219] re module doc has minor inaccuracy in character sets
Ezio Melotti ezio.melo...@gmail.com added the comment: Indeed. The tricks of putting '-' at the beginning/end and ']' at the beginning are well known and works with most of the implementations afaik, but I would consider the behavior of [._-a-z] as an implementation detail and don't expect it to work elsewhere. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13219 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13219] re module doc has minor inaccuracy in character sets
New submission from becky lewis bex.le...@gmail.com:
The documentation for the re module (specifically the section for []) states
that:
If you want to include a ']' or a '-' inside a set, precede it with a
backslash, or place it as the first character.
However, after finding a typo in a regex I wrote it turns out to be false.
Using the following regex finds a match:
regex = re.compile(r'[123ab-f-]+')
regex.match('-')
_sre.SRE_Match object at 0x8dd1b10
I am not sure if this is an issue with the documentation or if the re module
itself should not allow this behaviour. It would be nice if the documentation
warned that hyphens (and other 'special' characters such as [) that are not
escaped may still be matched, even though they are not the first character.
--
assignee: docs@python
components: Documentation
messages: 145911
nosy: becky.lewis, docs@python
priority: normal
severity: normal
status: open
title: re module doc has minor inaccuracy in character sets
versions: Python 2.7
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[issue13219] re module doc has minor inaccuracy in character sets
Ezio Melotti ezio.melo...@gmail.com added the comment: Here's a patch against 2.7. I rephrased the section a bit. If it's more understandable I'll commit it. -- assignee: docs@python - ezio.melotti keywords: +patch nosy: +ezio.melotti stage: - commit review versions: +Python 3.2, Python 3.3 Added file: http://bugs.python.org/file23474/issue13219.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13219 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
