How to force alpha or numeric inside text fields - LiveCycle Designer 9.0



I am creating a form that requires City, State and Zip.  I need to make sure that users do not put City, State and Zip into the City field; which someone so nicely pointed out to me as a problem with the form.  Anyway, what I am looking for is a way to force the user to only be able to enter alpha characters into the City text field.  I had glanced at the "Validation Patterns" OOTB functionality but I could not find anything listed that would complete the requirement.

Thank you,

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