Regular Expressions in Python: Coding Exercises

Regular Expressions in Python: Coding Exercises

Exercise #1

Write a Python program that asks the user to enter a password and checks whether it is valid based on the following rules:

1. The password must be at least 8 characters long.
2. It must contain at least one uppercase letter (A–Z).
3. It must contain at least one lowercase letter (a–z).
4. It must contain at least one number (0–9).
5. It must contain at least one special character (e.g., !@#$%^&*()_+-=[]{}|;:'",.<>?/).

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Exercise #2

Write a function that extracts all phone numbers from a given string. Assume phone numbers follow the format XXX-XXX-XXXX.

Exercise #3

Create a program that validates a given username. The username must start with a letter and contain only letters, digits, and underscores.