How to strip whitespace from before but not after punctuation in python

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Put a group around the text you want to keep and refer to that group by number in the replacement pattern:

re.sub(r'\s([?.!"](?:\s|$))', r'\1', text)

Note that I used a r'' raw string to avoid having to use too many backslashes; you didn’t need to add quite so many, however.

I also adjusted the match for the following space; it now matches either a space or the end of the string.

Demo:

>>> import re
>>> text = "This text . Is to test . How it works ! Will it! Or won't it ? Hmm ?"
>>> re.sub(r'\s([?.!"](?:\s|$))', r'\1', text)
"This text. Is to test. How it works! Will it! Or won't it? Hmm?"

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