multi field image validation is not working

registry.register("foundation.validation.validator", { selector: "[data-validation=text-validation]", validate: function(element) { let el = $(element); let pattern=/[0-9a-z]/; let value=el.val(); if(pattern.test(value)){ return "Please add only Upper Case Letters in First name"; } } }); this is working code for multi text field validation but same if i do it for image multifield not working