New submission from beardypig <beardy...@protonmail.com>:
I am experiencing and issue with the following regex when using finditer.
(?=<(?P<tag>\w+)/?>(?:(?P<text>.+?)</(?P=tag)>)?)", "<test><foo2/></test>
(I know it's not the best method of dealing with HTML, and this is a simplified
version)
For example:
[m.groupdict() for m in
re.finditer(r"(?=<(?P<tag>\w+)/?>(?:(?P<text>.+?)</(?P=tag)>)?)",
"<test><foo2/></test>")]
In Python 2.7, 3.5, and 3.6 it returns
[{'tag': 'test', 'text': '<foo2/>'}, {'tag': 'foo2', 'text': None}]
But starting with 3.7 it returns
[{'tag': 'test', 'text': '<foo2/>'}, {'tag': 'foo2', 'text': '<foo2/>'}]
The "text" group appears to be a copy of the previous "text" group.
Some other examples:
"<test>Hello</test><foo/>" => [{'tag': 'test', 'text': 'Hello'}, {'tag':
'foo', 'text': 'Hello'}] (expected: [{'tag': 'test', 'text': 'Hello'}, {'tag':
'foo', 'text': None}])
"<test>Hello</test><foo/><foo/>" => [{'tag': 'test', 'text': 'Hello'},
{'tag': 'foo', 'text': 'Hello'}, {'tag': 'foo', 'text': None}] (expected:
[{'tag': 'test', 'text': 'Hello'}, {'tag': 'foo', 'text': None}, {'tag': 'foo',
'text': None}])
----------
components: Regular Expressions
messages: 322771
nosy: beardypig, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: re.finditer and lookahead bug
type: behavior
versions: Python 3.7, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34294>
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