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You can constrain the values allowed in an entry field by using rules. To add a rule, click Add… on the Constraints tab of the element properties. In the Validation Rule: Select Rule Definition window, double-click Create New Rule… in the Allowed Values Rule or Regular Expression Rule list.

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Allowed Values Rule

Use the Allowed Values Rule dialog box to define a list of admissible values.
Screenshot of the Allowed Values Rule dialog box.

The Allowed Values Rule dialog box.

  • Rename… – Renames the rule. Enter a new name and click OK.
  • Text – Manages the list of allowed values:
    • Add – Adds the entered value to the list.
    • Remove – Removes the selected value from the list.
  • Allow entering custom values – Allows values that are not in the list. If cleared, only list values can be selected.

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Regular Expression Rule

Use the Regular Expression Rule dialog box to define admissible values with regular expressions.
Screenshot of the Regular Expression Rule dialog box.

The Regular Expression Rule dialog box.

  • Rename… – Renames the rule. Enter a new name and click OK.
  • Pattern – Manages the list of regular expressions:
    • Add – Adds the entered regular expression to the list. See also Regular expressions.
    • Remove – Removes the selected expression from the list.
  • Error message – Select Generate automatically to generate the error message text automatically, or clear it to enter custom text.