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gh-124130: Notes on empty string corner case of category \B #124133

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Sep 23, 2024
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gh-124130: Notes on empty string corner case of category \B #124133

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6 changes: 6 additions & 0 deletions Doc/library/re.rst
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Expand Up @@ -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``
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