How to Add a Custom Validation Rule?

Custom validation features are used to define validation rules using Regular Expressions. All these custom validators will be available in the Validations drop-down to set validations when creating or editing product fields.

To create new custom validators:

1. 1. Navigate to the Advanced Settings tab (WooCommerce → Extra Product Option → Advanced Settings)
   2. From the sections Custom validators, create new validators by providing all the required values.
      • Validator Label: The display name for the validation rule
      • Validator Pattern: A regular expression, which is used to match a valid input. The regular expression must be prefixed with /^ and suffixed with $/. Eg: /^[0-9]{5}$/
      • Validator Message: The message to be displayed when the validation fails. Use %s to include the field name in the validation messages.
   4.  Once added required validators, click on the Save changes button.
   5. The newly created validators will be available to choose from the Validations drop-down.