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[3.12] gh-124130: Notes on empty string corner case of category \B (GH-124133) (#124329)

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gh-124130: Notes on empty string corner case of category `\B` (GH-124133)
(cherry picked from commit d3e79d75d1)

Signed-off-by: y5c4l3 <y5c4l3@proton.me>
Co-authored-by: Y5 <124019959+y5c4l3@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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6
Doc/library/re.rst
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@ -572,6 +572,12 @@ character ``'$'``.
Word boundaries are determined by the current locale
if the :py:const:`~re.LOCALE` flag is used.
.. note::
Note that ``\B`` does not match an empty string, which differs from
RE implementations in other programming languages such as Perl.
This behavior is kept for compatibility reasons.
.. index:: single: \d; in regular expressions
``\d``