Java equalsignorecase and length

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Java

How to equalsIgnoreCase in the code. I want user to input ticket is ignore case.And how to make valid ticket between 5-7. Such as AB1234 is valid, asdfds123 is invalid.





import java.util.*;
public class Ticket
{
public static void main (String[] args)
{
Scanner keyboard = new Scanner(System.in);
boolean valid=false;
while(!valid)
{
valid = true;
System.out.print("Enter ticket >> ");
String ticket =keyboard.nextLine();

if((ticket.charAt(0)!='A')&&( ticket.charAt(1)!='B'))
{
valid = false;
System.out.println("First character must be one of 'A', 'B' or'C'");
}
}
}
}

What I have tried:

use equalsIgnoreCase

ticket = ticket.equalsIgnore(); is not working