[issue30004] in regex-howto, improve example on grouping
Cristian Barbarosie <cristian.barbaro...@gmail.com> added the comment: I'm sorry, I have no experience at all with Git. Could you please do it for me ? The bug appears in two places, see my first two messages. Thank you -- ___ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue30004> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30004] in regex-howto, improve example on grouping
Cristian Barbarosie added the comment: This topic seems stuck. Is there anything else I should do ? -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30004> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30004] in regex-howto, improve example on grouping
Cristian Barbarosie added the comment: Just discovered that a nearly identical example is presented in the end of section "Non-capturing and Named Groups". My proposal applies to this other example, too. And, by the way, reading this HOWTO has been very useful to me. -- ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30004> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30004] in regex-howto, improve example on grouping
New submission from Cristian Barbarosie:
In the Regular Expression HOWTO
https://docs.python.org/3.6/howto/regex.html#regex-howto
the last example in the "Grouping" section has a bug. The code is supposed to
find repeated words, but it catches false repetitions.
>>> p = re.compile(r'(\b\w+)\s+\1')
>>> p.search('Paris in the the spring').group()
'the the'
>>> p.search('k is the thermal coefficient').group()
'the the'
I propose adding a \b after \1, this solves the problem :
>>> p = re.compile(r'(\b\w+)\s+\1\b')
>>> p.search('Paris in the the spring').group()
'the the'
>>> print p.search('k is the thermal coefficient')
None
--
assignee: docs@python
components: Documentation
messages: 291209
nosy: Cristian Barbarosie, docs@python
priority: normal
severity: normal
status: open
title: in regex-howto, improve example on grouping
type: enhancement
versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7
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