Custom Validation Rules – ThemeHigh Help Center

Custom validator features can be used to define custom validation rules using RegEx which can be selected from the 'Validations' drop-down when creating or editing checkout fields.

Example:

To create new custom validators,

Go to Dashboard → WooCommerce → Checkout Form → Advanced Settings page. You can see a section Custom Validators with 4 fields showing Validator Name, Validator Label, Validator Pattern, and Validator Message.
Fill in the fields according to your requirements. Enter the regular expression to be validated in the Validator Pattern field.
Click on the Add New Validator button to get a new validator settings row.
Enter the validator settings.

Validator Name	A unique name for the validation rule, which will be used internally to identify the validator.
Validator Label	The display name for the validation rule.
Validator Pattern	A regular expression is used to match a valid input. Eg : /^[0-9]{5}$/. The regular expression must be prefixed with /^ and suffixed with $/.
Error Message	The message to be displayed when the validation fails. Use %s to include field names in validation messages.

Save Changes.
Newly created validators will be available to choose in the Validations drop-down.

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