With the validated cell being A2:

=PRODUCT(--(CODE(MID(A2,ROW(INDIRECT("1:2")),1))=65))*PRODUC T(--(CODE
(MID(A2,ROW(INDIRECT("1:2")),1))<=90))*PRODUCT(--ISNUMBER(--MID(A2,ROW
(INDIRECT("3:7")),1)))

A bit complex but ensures that no . or E will be used in the last five
digits.

HTH
Kostis Vezerides

On Nov 28, 7:23*pm, wrote:
I want to use a non vb formula in data validation for an excel formula
to make the user enter the first 2 characters of a field as UPPERCASE
letters i.e. AB12345 - the format is always the same 2 letters 5
numbers.

Any ideas?