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Limiting User Input to Alphabetic Characters Only


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I have been given the task of setting up an employee database using Filemaker Pro. Unfortunately I know very little about FMP. Is it possible to limit a field's valid input to just alphabetic characters and, if so, how is this done?

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In your field validation specify a calculation of

PatternCount(field, "A") + PatternCount(field, "B") + PatternCount(field, "C")...+ PatternCount(field,"Z") = Length(field)

Then, make it Strict and enter a message along the lines of 'Enter only alphabetic characters.'

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