How to Remove All Non-Alphanumeric Characters in Python

Submitted by razormist on Tuesday, February 11, 2025 - 23:35.

In this tutorial, we’ll learn how to program "How to Remove All Non-Alphanumeric Characters in Python." The objective is to properly remove all non-alphanumeric characters from a given string input. This tutorial will guide you through the process of removing unwanted characters from a string efficiently. So, let’s get started!

This topic is straightforward to understand. Just follow the instructions I provide, and you’ll complete it with ease. The program I’ll demonstrate will show you the proper way to remove non-alphanumeric characters. So, let’s dive into the coding process!

Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.

import re
 
while True:
    print("\n================= Remove All Non-Alphanumeric Characters =================\n\n")
 
 
    string = input("Enter a string: ")
 
 
    remove = re.sub(r'[^a-zA-Z0-9]', '', string)
 
 
    print(remove)
 
    opt = input("\nDo you want to try again?(yes/no): ")
 
    if opt.lower() == 'yes':
        ret=False
    elif opt.lower() == 'no':
        ret=True
        print("Exiting program....")
    else:
        print("Please enter yes/no:")
        break
 
    if ret == False:
        continue

This program removes all non-alphanumeric characters (such as punctuation, spaces, and symbols) from a given input string using regular expressions (re.sub). It runs in a loop, allowing the user to enter different strings until they decide to exit.

Output:

There you have it we successfully created How to Remove All Non-Alphanumeric Characters in Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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