add_action( 'elementor_pro/forms/validation/tel', function( $field, $record, $ajax_handler ) { // Match this format XXX-XXX-XXXX, 123-456-7890 if ( preg_match( '/[0-9]{3}-[0-9]{3}-[0-9]{4}/', $field['value'] ) !== 1 ) { $ajax_handler->add_error( $field['id'], 'Please make sure the phone number is in XXX-XXX-XXXX format, eg: 123-456-7890' ); } }, 10, 3 );