Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Abra o console para ver o output.</h1>

JavaScript

var str = "div.classe1{background:red}.classe2 div a{background:#00f}.classe3.classe4{background:green}.classe5{background:#ff0}",
    achados = str.match('\.(-?[_a-zA-Z]+[_a-zA-Z0-9-]*)(?![^\{]*\})');
console.log(achados);

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JSFiddle - React, Tailwind, and code Playground

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JavaScript

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Use pre-released features

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Console