JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = '.playlist-item:nth-child(2n+1)';
var selector = /.playlist-item:nth-child\(2n\+1\)/g;
var s = '.playlist-item:nth-child\(2n\+1\)';

console.log(selector.test(a)) //true

var reg = new RegExp(s, "g");
console.log(reg.test(a)) //false