Pattern matches in java

hi i have code which validate code enter by user

the requirement say the maxlength=2 and minlength=1 and is a string

the user can enter code as follows

00

A1

HH

12

10

09

I have this code

Java Code:

public boolean isValidPattern(String s_value, String s_pattern)

    {

        boolean flag = false;

 

        if (Pattern.matches(s_pattern, s_value))

        {

            flag = true;

        }

 

        return flag;

    }

 

if (!isValidPattern(code, "[0-9X]{1,2}"))

            {

           

            if(!isValidPattern(code, "[A-Z]{1,2}"))  

              

            {

               System.out.println("wrong patten code ");

            }

my problem is when user put

A1 AM geting error