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:
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- Navigate to the Advanced Settings tab (WooCommerce → Extra Product Option → Advanced Settings)
- 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.
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- Once added required validators, click on the Save changes button.
- The newly created validators will be available to choose from the Validations drop-down.