验证一串文本以匹配java中的每个确定的格式

I'm attempting to write a validation method that will validate if someone has entered their license number in error, I've searched around and found some ideas but I just cant get the result that I want. The correct format should be TWO letters followed by SEVEN numbers, the two letters and seven numbers could change but the format should remain the same for exmaple:I'm attempting to write a validation method tha