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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.python
Subject: Re: Python Dialogs (Posting On Python-List Prohibited)
Date: Fri, 3 May 2024 02:02:57 -0000 (UTC)
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> Assume you have an expression "s.replace('a','b').replace('c','d').
> replace('e','f').replace('g','h')". Its value is a string which
> is the value of s, but with "a" replaced by "b", "c" replaced by
> "d", "e" replaced by "f" and "g" replaced by "h". How to modify
> this expression, so that "a", "c", "e", and "g", respectively,
> are replaced only if they are words (but not parts of words)?

    import re

    replacements = (("a", "b"), ("c", "d"), ("e", "f"), ("g", "h"))

    text = "this be a test g eg"

    "".join \
      (
        repl.get(s, s)
        for repl in (dict(replacements),)
        for s in
            re.split("\\b(" + "|".join(re.escape(s[0]) for s in replacements) + ")\\b", text)
      )

result:

    'this be b test h eg'