python - how to remove whitespace inside bracket?

Question

I have the following string:

res = '(321, 3)-(m-5, 5) -(31,1)'

I wanna remove the whitespace withing the bracket but i haven't any knowledge about regular expression

I ve try this but that doesn't work:

import re
res = re.sub(r'(.*s+)', '', res)

Answer 1

You can substitute a non-greedy wildcard match for characters in parentheses with a function that splits the match on whitespace and rejoins it.

>>> import re
>>> res = '(321, 3)-(m-5, 5) -(31,1)'
>>> re.sub(r'(.*?)', lambda x: ''.join(x.group(0).split()), res)
'(321,3)-(m-5,5) -(31,1)'