https://github.com/faraazarsath/user-registration-login

This Python script provides a simple user registration system with username and password validation using regular expressions. It also includes a password recovery option.
https://github.com/faraazarsath/user-registration-login

filehandling if-else python regular-expression

Last synced: about 2 months ago
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This Python script provides a simple user registration system with username and password validation using regular expressions. It also includes a password recovery option.

• Host: GitHub
• URL: https://github.com/faraazarsath/user-registration-login
• Owner: FaraazArsath
• Created: 2022-07-29T18:34:45.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2025-02-15T05:48:27.000Z (over 1 year ago)
• Last Synced: 2025-03-05T22:48:48.890Z (over 1 year ago)
• Topics: filehandling, if-else, python, regular-expression
• Language: Jupyter Notebook
• Homepage:
• Size: 12.7 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# User Authentication System in Python

A simple Python program for user registration, login, and password recovery, utilizing regular expressions for input validation.

## 🚀 Features

User Registration: Allows users to create a username and password, ensuring they meet predefined validation criteria.

User Login: Enables existing users to log in securely using stored credentials.

Password Recovery: Provides users with an option to recover their password by verifying their username.

## 🔧 Functions

register() → Creates a new user account. Validates the username using a regular expression to ensure an email-like format.

passwd() → Prompts users to set a password, enforcing strong password rules (uppercase, lowercase, digit, and special character).

forgetpassword() → Initiates the password recovery process by verifying the provided username.

## 🛠 Regular Expressions

Username Validation:

r'^[a-zA-Z]+[._]?[a-zA-Z0-9]+[@]\w+[.]\w{2,3}$'

Password Validation:

r"^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#])"

## 📂 Note

User data is securely stored in a file named database.txt.