Use an on-exit macro to validate the input.

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Hope this helps
Doug Robbins - Word MVP
> Can an input mask be associated with a Word form field on a form? (all
> versions)
Doug Robbins has given you the most comprehensive solution. Some formats
such as date or number can be set in the field properties. For more about
online forms, follow the links at <URL:
http://word.mvps.org/FAQs/Customization/FillinTheBlanks.htm> especially Dian
Chapman's series of articles.
Hope this helps,

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Charles Kenyon
See the MVP FAQ: <URL: http://www.mvps.org/word/> which is awesome!
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> Can an input mask be associated with a Word form field on a form? (all
> versions)