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bpo-32308: Replace empty matches adjacent to a previous non-empty match in re.sub(). (#4846)

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Serhiy Storchaka 2018-01-04 11:06:13 +02:00 • committed by GitHub
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Doc/howto/regex.rst
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@ -1140,12 +1140,12 @@ new string value and the number of replacements that were performed::
>>> p.subn('colour', 'no colours at all')
('no colours at all', 0)
Empty matches are replaced only when they're not adjacent to a previous match.
Empty matches are replaced only when they're not adjacent to a previous empty match.
::
>>> p = re.compile('x*')
>>> p.sub('-', 'abxd')
'-a-b-d-'
'-a-b--d-'
If *replacement* is a string, any backslash escapes in it are processed. That
is, ``\n`` is converted to a single newline character, ``\r`` is converted to a