Python Exercise 17 – Validate Password with Regex

Python Exercise 17 Problem:

In this Python exercise, write a Python program that will prompt a user to input a password. The password must be validated to meet a certain criteria as shown below with regular expressions (RegEx).

Exercise Requirements:

• Minimum length of transaction password: 8
• Maximum length of transaction password: 15
• Minimum of 1 letter between: a-z
• Minimum of 1 letter between: A-Z
• Minimum of 1 number: 0-9
• Minimum of 1 character: !@#$%^&*

Solution Python Exercise 17

Python Code Input:

import re

symbols = ['!', '@', '#', '$', '%', '^', '&', '*', '(', ')']
print("""The password must meet the below requirements:
        Minimum of 8 characters
        Maximum of 15 characters
        Must have lowercase alphabetical characters: a-z
        Must have 1 alphabetical character should be of Upper Case: A-Z
        Must have 1 number between 0-9
        Must have 1 special character from !@#$%^&*
        """)

password = input("Please enter a password: ")

def regexPasswordValidation():
    regex = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[!@#$%^&*])[A-Za-z\d@$!#%*?&]{8,15}$"
    regex_compile = re.compile(regex)

    valid = re.search(regex_compile, password)

    if valid: 
        print("Valid Password") 
    else: 
        print("Invalid Password") 
  
regexPasswordValidation()

User Input for Valid Password:

Please enter a password: ABH12Ab$

Output for Valid Password:

Valid Password

User Input for Invalid Password:

Please enter a password: an49K

Output for Invalid Password:

Invalid Password