textbox scan for barcode

Hi..

I have using userform for scan barcode
I have 2 textbox and in textbox2 is where i scan barcode

my barcode start with alphabhets RD with 9 digit number and MY

for an example RD123456789MY

When scan barcode in second textbox
I want the textbox2 to check then len is 13 and the left words must start with RD and last words must MY
if scan with different barcode numbers the textbox must setfocus and clear text in textbox2 untill scan correct barcode numbers.

Thanks