From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Date: Mon, 23 Sep 2024 07:05:24 +0000 (+0200) Subject: [3.12] gh-124130: Notes on empty string corner case of category `\B` (GH-124133)... X-Git-Tag: v3.12.7~67 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d5aafe7713c9732eecceaeb4933f4623fe96b50d;p=thirdparty%2FPython%2Fcpython.git [3.12] gh-124130: Notes on empty string corner case of category `\B` (GH-124133) (#124329) gh-124130: Notes on empty string corner case of category `\B` (GH-124133) (cherry picked from commit d3e79d75d164c338a64fd66edb26e69c501cee58) Signed-off-by: y5c4l3 Co-authored-by: Y5 <124019959+y5c4l3@users.noreply.github.com> Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com> --- diff --git a/Doc/library/re.rst b/Doc/library/re.rst index 3c9b99c6438a..0a8391a0c0c8 100644 --- 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:: + + 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``