New submission from William Budd:
pattern = re.compile('<div>(<p>.*?</p>)</div>', flags=re.DOTALL)
----------------------------------------------------------------
# This works as expected in the following case:
print(re.sub(pattern, '\\1',
'<div><p>foo</p></div>\n'
'<div><p>bar</p>123456789</div>\n'))
# which outputs:
<p>foo</p>
<div><p>bar</p>123456789</div>
----------------------------------------------------------------
# However, it does NOT work as I expect in this case:
print(re.sub(pattern, '\\1',
'<div><p>foo</p>123456789</div>\n'
'<div><p>bar</p></div>\n'))
# actual output:
<p>foo</p>123456789</div>
<div><p>bar</p>
# expected output:
<div><p>foo</p>123456789</div>
<p>bar</p>
----------------------------------------------------------------
It seems that pattern matching/substitution iterations only go haywire once the
matching iteration immediately prior to it turned out not to be a match. Maybe
some internal variable is not cleaned up properly in an edge(?) case triggered
by the example above?
----------
components: Regular Expressions
messages: 296506
nosy: William Budd, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: re.sub substitution match group contains wrong value after unmatched
pattern was processed
versions: Python 3.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue30720>
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