Notes on empty string corner case of category \B

Signed-off-by: y5c4l3 <y5c4l3@proton.me>
python · Sep 21, 2024 · 0313791 · 0313791
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commit 0313791
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diff --git a/Doc/library/re.rst b/Doc/library/re.rst
@@ -572,6 +572,12 @@ character ``'$'``.
    Word boundaries are determined by the current locale
    if the :py:const:`~re.LOCALE` flag is used.
 
+   .. note::
+
+      However, ``\B`` does not match an empty string, which acts a little bit
+      different compared to other implementations. This behavior is currently
+      kept for compatibility considerations.
+
 .. index:: single: \d; in regular expressions
 
 ``\d``