[New-bugs-announce] [issue14461] In re's positive lookbehind assertion documentation match() cannot match
py.user
report at bugs.python.org
Sun Apr 1 10:12:00 CEST 2012
New submission from py.user <port139 at yandex.ru>:
http://docs.python.org/py3k/library/re.html
"Note that patterns which start with positive lookbehind assertions will never match at the beginning of the string being searched; you will most likely want to use the search() function rather than the match() function:"
>>> re.match(r'(?<=^)abc', 'abc').group()
'abc'
>>> re.match(r'(?<=\b)abc', 'abc').group()
'abc'
>>> re.match(r'(?<=\A)abc', 'abc').group()
'abc'
>>> re.match(r'(?<=\A)abc', 'abc', re.DEBUG).group()
assert -1
at at_beginning_string
literal 97
literal 98
literal 99
'abc'
>>>
in some cases match() can match
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assignee: docs at python
components: Documentation, Regular Expressions
messages: 157265
nosy: docs at python, ezio.melotti, mrabarnett, py.user
priority: normal
severity: normal
status: open
title: In re's positive lookbehind assertion documentation match() cannot match
versions: Python 3.2
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14461>
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