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[3.12] gh-101699: Explain using Match.expand with \g<0> (GH-101701) #115583

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Feb 17, 2024
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[3.12] gh-101699: Explain using Match.expand with \g<0> (GH-101701) #115583

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3 changes: 2 additions & 1 deletion Doc/library/re.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1338,7 +1338,8 @@ when there is no match, you can test whether there was a match with a simple
Escapes such as ``\n`` are converted to the appropriate characters,
and numeric backreferences (``\1``, ``\2``) and named backreferences
(``\g<1>``, ``\g<name>``) are replaced by the contents of the
corresponding group.
corresponding group. The backreference ``\g<0>`` will be
replaced by the entire match.

.. versionchanged:: 3.5
Unmatched groups are replaced with an empty string.
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