Attribute Error for Rename / Replace

[snippsat]

. My directory has files that look like this: 20191210.092030_Monthly_Service_Cost_12-10-2019-02-17
Ultimately, I would like my zip file to look like MonthlyServiceCost.zip

A would write regex to clean it up first,then add .zip.
Example.

>>> import re 
>>> 
>>> s = '20191210.092030_Monthly_Service_Cost_12-10-2019-02-17'
>>> r = re.search(r'_(.*[a-zA-Z])', s)
>>> result = r.group(1).replace('_', '')
>>> print(f'{result}.zip')
MonthlyServiceCost.zip
>>> 
>>> s = '9999.777.44_Monthly_Service_Cost_111-777_999.44'
>>> r = re.search(r'_(.*[a-zA-Z])', s)
>>> result = r.group(1).replace('_', '')
>>> print(f'{result}.zip')
MonthlyServiceCost.zip