Exercise: Form Validation

Context

In modern software applications, data integrity is crucial. Before storing user information in a database, applications must ensure that the provided data is accurate, clean, and follows required formats. This process is known as input validation.

Objective

Design and implement a Python command-line utility that mimics a user registration form. The application must prompt the user for specific details, validate the formats of the inputs, and only allow a successful "submission" if all fields meet the criteria.