/   A000
|   A1[01][0-9]
|   A12[0-3]
|   A[23][0-9]{2}
|   A4[0-4][0-9]
|   A45[0-9]
|   A999
|   B000
|   B789
|   B79[0-9]
|   B8[0-7][0-9]
|   B88[0-8]
/x