# Create An Email Validation Using Regular Expression in The Python Assignment Solution

June 29, 2024
Dr. Victoria
🇬🇧 United Kingdom
Python
Dr. Victoria Campbell holds a Ph.D. in Computer Science from a leading university in the UK and has completed over 800 assignments related to Python file handling. With a passion for teaching and research, Dr. Campbell specializes in complex data manipulation, optimization algorithms, and machine learning applications in Python. Her expertise includes text file parsing, CSV data processing, and implementing advanced error handling mechanisms.
Key Topics
• Instructions
• Objective
• Requirements and Specifications
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## Instructions

### Objective

Write a python assignment program to create an email validation using regular expression.

## Requirements and Specifications

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Source Code

```TASK 1 def factorial(n): # starting with value 1 result = 1 # keep multiplying by consecutive integers including n for i in range(n): result *= (i + 1) return result def main(): # keep asking user until nonnegative value is entered while True: n = int(input('Please input a nonnegative integer? ')) if n >= 0: # calculating factorial of given integer print('Factorial of', n, ':', factorial(n)) return else: # showing error message print('Please enter a nonnegative integer') print() if __name__ == '__main__': main() TASK 2 def factorial(n): # if n == 0, returning 1 if n == 0: return 1 # returning result as a product of (n-1)! and n return factorial(n-1) * n def main(): # keep asking user until nonnegative value is entered while True: n = int(input('Please input a nonnegative integer? ')) if n >= 0: # calculating factorial of given integer print('Factorial of', n, ':', factorial(n)) return else: # showing error message print('Please enter a nonnegative integer') print() if __name__ == '__main__': main() TASK 3 import re def check_email(email): # using following regex: # - positive number of symbols: alphanumeric/-/. # - single @ # - positive number of symbols: alphanumeric/-/. regex = '^[\w\-.]+[@][\w\-.]+\$' if re.search(regex, email): # if email matches pattern, searching for index of '@' idx = email.index('@') # returning separated username and host, as a tuple return email[:idx], email[idx+1:] # if valid is not valid, returning None return None def main(): # keep asking user until value email is entered while True: result = check_email(input('Please input your email address:').strip()) if result: # outputting result of email parsing print('email: ', result[0] + '@' + result[1], ',', 'username: ', result[0], ',', 'host: ', result[1]) return else: # showing error message print('Not a valid email.') print() if __name__ == '__main__': main() ```

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