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Extract punctuation from the specified column of Dataframe using Regex

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  • Last Updated : 29 Dec, 2020
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Prerequisite: Regular Expression in Python

In this article, we will see how to extract punctuation used in the specified column of the Dataframe using Regex.

Firstly, we are making regular expression that contains all the punctuation: [!”\$%&\'()*+,\-.\/:;=#@?\[\\\]^_`{|}~]* Then we are passing each row of specific column to re.findall() function for extracting the punctuation and then assigning that extracted punctuation to a new column in a Dataframe.

re.findall() function is used to extract all non-overlapping matches of pattern in string, as a list of strings. The string is scanned left-to-right, and matches are returned in the order found.

Syntax: re.findall(regex, string) 

Return: All non-overlapping matches of pattern in string, as a list of strings.

Now, Let’s create a Dataframe:

Python3




# import required libraries
import pandas as pd
import re
  
# creating Dataframe with
# name and their comments
df = pd.DataFrame({
    'Name' : ['Akash', 'Ashish', 'Ayush',
              'Diksha' , 'Radhika'],
    
    'Comments': ['Hey! Akash how r u'
                 'Why are you asking this to me?' ,
                 'Today, what we are going to do.' ,
                 'No plans for today why?' ,
                 'Wedding plans, what are you saying?']},
    
    columns = ['Name', 'Comments']
    )
  
# show the Dataframe
df

Output:

Now, Extracting the punctuation from the column comment:

Python3




# define a function for extracting
# the punctuations
def check_find_punctuations(text):
    
    # regular expression containing
    # all punctuation
    result = re.findall(r'[!"\$%&\'()*+,\-.\/:;=#@?\[\\\]^_`{|}~]*'
                        text)
      
    # form a string
    string = "".join(result)
      
    # list of strings return
    return list(string)
    
# creating new column name
# as a punctuation_used and 
# applying user defined function
# on each rows of Comments column
df['punctuation_used'] = df['Comments'].apply(
                         lambda x : check_find_punctuations(x)
                         )
  
# show the Dataframe
df

Output:


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