Question

I am confused about strings and int. and can’t validate a name to be without numbers and strange charchters. a-z and A-Z are fine. I understand the do while loop and use of a sentinel. I seen Regex on here but it doesn’t work in my code for some reason unknown to me. I would rather go with a simple solution that I can understand it. I have validation of int in my code working great, but validating the name gets bool, and int errors.

    static void Main(string[] args)
    {
        int age;
        double mileage;
        string strInput, name;
        bool isValid;

        DisplayApplicationInformation();

        DisplayDivider("Start Program");
        Console.WriteLine();

        DisplayDivider("Get Name");
        strInput = GetInput("your name");
        name = strInput;
        Console.WriteLine("Your name is: " + name);
        Console.WriteLine();

        do
        {
        DisplayDivider("Get Age");
        strInput = GetInput("your age");
        isValid = int.TryParse(strInput, out age);
        if (!isValid || (age <= 0))
        {
            isValid = false;
            Console.WriteLine("'" + strInput + "' is not a valid age entry. Please retry...");
        }
        }while (!isValid);
        Console.WriteLine("Your age is: " + age);
        //age = int.Parse(strInput);
        //Console.WriteLine("Your age is: " + age);
        Console.WriteLine();

        do
        {
        DisplayDivider("Get Mileage");
        strInput = GetInput("gas mileage");
        isValid = double.TryParse(strInput, out mileage);
        if (!isValid || (mileage <= 0))
        {
            isValid = false;
            Console.WriteLine("'" + strInput + "' is not a valid mileage entry. Please retry...");
        }
        } while (!isValid);
        Console.WriteLine("Your age is: " + mileage);
        //mileage = double.Parse(strInput);
        //Console.WriteLine("Your car MPT is: " + mileage);

        TerminateApplication();
    }

Answer 1

Here is a Regex that works for what you want

        Regex reg = new Regex("^[A-Za-z]+$");
        do
        {
            DisplayDivider("Get Name");
            strInput = GetInput("your Name");
            isValid = reg.IsMatch(strInput);
            if (!isValid)
            {
                isValid = false;
                Console.WriteLine("'" + strInput + "' is not a valid name entry. Please retry...");
            }
        } while (!isValid); 

Basically, it says, “Match start of the string (^ means start) and only letter till end of string ($ means end of string) and there must be 1 or more letters (that’s the +)”

Probably the easiest

Now, this is assuming of course that you don’t want “Firstname Lastname” because that would mean there is a space involved. Let me know if you need spaces for name separations.