Matthew Barnett <[email protected]> added the comment:
Arguments are evaluated first and then the results are passed to the function.
That's true throughout the language.
In this instance, you can use \g<1> in the replacement string to refer to group
1:
re.sub(r'([a-z]+)', fr"\g<1>{REPLACEMENT}", 'something')
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<https://bugs.python.org/issue41885>
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