Want a regex for validating Indian Vehicle Number Format?

Question

Hello everyone here...

I need to build up a swing application related to vehicle registration and in which i want to do input the vehicle number of indian standard, like

Answer 1

Say for example if the user already entered a value like:

DL 

then the textbox did not take the next input any other than a integer or one more char as.....

DL C 

from here user can only enter a integer value............

So, in short what i want to do is to take the input only like that regex given by Alix

Based on the Wikipedia Specs

^[A-Z]{2}[ -][0-9]{1,2}(?: [A-Z])?(?: [A-Z]*)? [0-9]{4}$