InfoPath Dev

Hi All:

I'm new to Infopath and am sure there is a simple solution to this, but I can't seem to find an answer using data validation.

I have a textbox on a form. The text field must contain any combination of 12 alpha numeric values (must be 12, cannot be less).

Examples:

1234567890AA (this is ok)

1234R567D5S7 (this is ok)

12345T5 (this is wrong)

Can anyone help me via a rule or data validation?

Thanks for any help

You can do this validation via string-length (.) > 12 AND string-length(.) < 12. See the attached template for a sample.

Ernesto:

 This is perfect! Thanks! How would  also keep them from entering "special" characters (i.e. @, #, $, %, /, etc)

Thanks for the quick reply!!

Jeff