JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<a href="#respond">Test</a>

JavaScript

var test = JSON.parse('{"regex":"/\\\\d+/"}');
alert(test.regex);