JSFiddle - React, Tailwind, and code Playground

http://stackoverflow.com/questions/5898656/test-if-an-element-contains-a-class

HTML

<p class="a-team" id="a"></p>

JavaScript

var el = document.getElementById('a');
var cl = 'team'; // tested classname
var re = new RegExp('\\b'+cl+'\\b');
alert(re.test(el.className)?'y':'n');
// a minus character problem