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Can I restrict the length or force a format when a user enters data in a form's field?
If you want to restrict the number of characters in a text field, please see our Set Maximum Length for Entries in a Text Field help topic. If you want to limit the length of another field type, the only workaround is to create a separate formula text field that uses the Length() function and perhaps build a report of non-compliant records. To learn more, please see our Length formula function page.