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From: Alan Bawden <alan@csail.mit.edu>
Newsgroups: comp.lang.python
Subject: Re: Correct syntax for pathological re.search()
Date: Tue, 08 Oct 2024 16:59:48 -0400
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Karsten Hilbert <Karsten.Hilbert@gmx.net> writes:

           Python 3.11.2 (main, Aug 26 2024, 07:20:54) [GCC 12.2.0] on linux
           Type "help", "copyright", "credits" or "license" for more information.
           >>> tex = '\sout{'
           >>> tex
           '\\sout{'
           >>>

   Am I missing something ?

You're missing the warning it generates:

        > python -E -Wonce
        Python 3.11.2 (main, Aug 26 2024, 07:20:54) [GCC 12.2.0] on linux
        Type "help", "copyright", "credits" or "license" for more information.
        >>> tex = '\sout{'
        <stdin>:1: DeprecationWarning: invalid escape sequence '\s'
        >>>