Regex Textfield: Gravityforms Add-on

General tab of the Regex Textfield field in the form editor.

General tab of the Regex Textfield field with a filled in regex string.

Appearance tab of the Regex Textfield field with a custom validation message.

Form preview with the Regex Textfield field with an incorrect input.

Form preview with the Regex Textfield field where the field is set to be required, but no regex string is defined.