JSFiddle - React, Tailwind, and code Playground

HTML

<div class="danger n133">test</div>
<div class="n133 danger">test</div>

JavaScript

var selector = 'danger n133',
    betterSelector = '.' + selector.replace(/ /g, '.');
console.log(betterSelector)

alert('old selector: ' + $("div[class='" + selector + "']").length + ', new selector: ' + $("div" + betterSelector).length);