When applying Document Extraction Feature, you are not able to add field validator directly when creating package. But you can achieve that by following steps:
(1)create the package and leave it in "DRAFT"
(2)use code in this example to add fieldValidator for specific field. (To notice, if your pdf form property name of the field is given by [Signer1.Capture1.Textfield1], your textfield will has a name of “TEXTFIELD10″(all upper case plus 10 multiples the ending number you use))
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