I'm writing a program for Uni which requires some basic validation. 

I have a textbox which allows the user to input their age. I have successfully written a Regex expression which checks if the value entered into the textbox contains numeric values only and is two characters long:

```
Regex agePattern = new Regex(@"^[0-9]{1,2}\z$"); // Age entered must be numeric characters only (0-9) and may only be two charaters long

        if (agePattern.IsMatch(ageBox.Text) == false)
        {
            MessageBox.Show("Customer's age is not valid. Age must be in numeric format & can only be two characters long"); // If Regex pattern & entered string DO NOT match - user get's this message
            return;
        }
        else
        {
            // do something
        }

```

My question is, can I extend my Regex expression to constrain age values between 1 and 99?

I've not written any Regex before and I'm struggling. 

Thanks!