Custom Validation

Hello sir,
I want to add custom validation a textarea. Tried different options but no success. Can you help me to solve this issue.

add_action( 'user_registration_validate_textarea_1666081401','ur_validate_textarea_1666081401',10,4);
function ur_validate_textarea_1666081401($single_form_field, $data, $filter_hook, $form_id) {    
	global $wpdb;
    $field_label = isset( $data->label ) ? $data->label : '';
    $value = isset( $data->value ) ? $data->value : '';
	if( 'textarea_1666081401' === $single_form_field->general_setting->field_name ) {
		if ( 10 < strlen( $value ) ) {
		add_filter($filter_hook, function ( $msg ) use ( $field_label ) {
			return __( $field_label . ' cannot exceed 10 characters.', 'user-registration' );
			});
		}
	}
}

Thank you