10000 [3.11] gh-101699: Explain using Match.expand with \g<0> (GH-101701) by miss-islington · Pull Request #115584 · python/cpython · GitHub
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[3.11] gh-101699: Explain using Match.expand with \g<0> (GH-101701) #115584

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Feb 17, 2024
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[3.11] gh-101699: Explain using Match.expand with \g<0> (GH-101701) #115584

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gh-101699: Explain using Match.expand with \g<0> (GH-101701) 
Update documentation for re library to explain that a backreference `\g<0>` is
expanded to the entire string when using Match.expand().
Note that numeric backreferences to group 0 (`\0`) are not supported.

(cherry picked from commit d2d7808)

Co-authored-by: Stevoisiak <S.Vascellaro@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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@Stevoisiak @serhiy-storchaka @miss-islington
2 people authored and miss-islington committed Feb 17, 2024
commit b66d46f0ca3a9399ee4b8bea75c3b5ab3110b35a
3 changes: 2 additions & 1 deletion Doc/library/re.rst
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Expand Up @@ -1336,7 +1336,8 @@ 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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