JSFiddle - React, Tailwind, and code Playground
HTML
<span id="16K"></span>
<span id="16Kk"></span>
<span id="16M"></span>
<span id="16MK"></span>
Match: <span id="match"></span>
JavaScript
$(document).ready(function(){
$('#match').html(
$("[id^='16']").filter(
function() {
console.log(this.id.match(/16[a-zA-Z](?![a-zA-Z])/g));
return this.id.match(/16[a-zA-Z](?![a-zA-Z])/g);
}).each().attr('id')
);
});