Use DV with a formula of

=AND(LEN(A1)=10,ISNUMBER(--(LEFT(A1,5))),CODE(LOWER(MID(A1,6,1)))=97,CODE(LO WER(MID(A1,6,1)))<=122,ISNUMBER(--(RIGHT(A1,4))))

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HTH

Bob

(there's no email, no snail mail, but somewhere should be gmail in my addy)

"Dan" wrote in message
...
I need a function to text user input. The input must be 10 characters in
length, consist of 5 digits, 1 letter and then 4 digits (a property
barcode).
Examples:
00015D6345
01451A0011
Any other format will get an error message.
Can someone help me?
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Dan