> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Constraints

> Impose constraints on entry, date, and numeric field values with rules that define admissible value lists, regular expressions, and date or numeric ranges.

You can impose constraints on the values entered when filling out a form. Constraints are applied to field values by using rules. A rule can specify a list of admissible values, a regular expression, or a date or numeric interval.

Configure constraints on the **Constraints** tab of the **Element Properties** window. You can set constraints for the following elements:

* [Entry fields](/flexi-capture/form-designer/element-entry-field)
* [Date fields](/flexi-capture/form-designer/element-date-field)
* [Numeric fields](/flexi-capture/form-designer/element-number-field)