EXP7_REGEX

using System.Text.RegularExpressions;
static void Main(string[] args)
{
    string mobileRegex = @"^\d{10}$";
    string emailRegex = @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$";
    string nameRegex = @"^[a-zA-Z\s]+$";
    bool exitRequested = false;
    while (!exitRequested)
    {
        Console.WriteLine("Choose what you want to validate:");
        Console.WriteLine("1. Name");
        Console.WriteLine("2. Email");
        Console.WriteLine("3. Mobile Number");
        Console.WriteLine("4. Exit");

        int choice;
        if (!int.TryParse(Console.ReadLine(), out choice) || choice < 1 || choice > 4)
        {
            Console.WriteLine("Invalid choice. Please choose a number between 1 and 4.");
            continue;
        }
        string userInput;
        switch (choice)
        {
            case 1:
                Console.WriteLine("Enter name:");
                userInput = Console.ReadLine();
                Console.WriteLine("Name - Valid: " + Regex.IsMatch(userInput, nameRegex));
                break;
            case 2:
                Console.WriteLine("Enter email address:");
                userInput = Console.ReadLine();
                Console.WriteLine("Email - Valid: " + Regex.IsMatch(userInput, emailRegex));
                break;
            case 3:
                Console.WriteLine("Enter mobile number:");
                userInput = Console.ReadLine();
                Console.WriteLine("Mobile Number - Valid: " + Regex.IsMatch(userInput, mobileRegex));
                break;
            case 4:
                exitRequested = true;
                break;
        }
    }
    Console.WriteLine("Exiting program...");
}