Regex

import re 
s = "string. With. Punctuation?" 
s = re.sub(r'[^\w\s]','',s) 
# importing pandas as pd 
import pandas as pd 
  
# Creating the dataframe  
df = pd.read_csv("nba.csv") 
  
# Using regular expression to extract all 
# columns which has letter 'a' or 'A' in its name. 
df.filter(regex ='[aA]') 

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