/**
Exercise#19
Write a program that would determine if the string inputted by the user is a valid code or not.
Here are the scenarios for you to be a valid code:
1. a code should have a maximum length of 5.
2. a code should start with a letter.
3. a code could contain a digit.
4. a code should end with an asterisk(*).
Ex. input: aj#kj
	invalid code
    input: a23k*
	valid code
*/

 import java.util.Scanner;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 public class Exer19 {

    public static void main(String args[]) {

        String regex = "(.)*(\\d)(.)*\\*";
        Pattern pattern = Pattern.compile(regex);

        Scanner reader = new Scanner(System.in);
        String input = "TEST";

       System.out.println("Enter a valid string : ");

       while (!input.equalsIgnoreCase("EXIT")) {

            input = reader.nextLine();

            Matcher matcher = pattern.matcher(input);

            boolean isMatched = matcher.matches();
            if (!isMatched) {
                System.out.println("Invalid code");

            } else {

                if(input.length()> 5)
						{
							System.out.println("Invalid code");
						}
						else if(input.substring(0,1).matches("[0-9]"))
						{
							System.out.println("Invalid code");

           				}
           				else
           				{
							System.out.println("Valid code");
						}
        }
    }

}
}