JSFiddle - React, Tailwind, and code Playground

by LuckyCat

HTML

<div class="wrapper bg_2 bg_3">Hello</div>

JavaScript

var wrapper = document.querySelector('.wrapper');

function removeClass(el, classNameMask) {  
    var exp = new RegExp("\\b\\s+" + classNameMask + ".*?\\w\\b", "g");
    el.className = el.className.replace(exp, '');
}

// removeClass(wrapper, 'bg_');
removeClass(wrapper, 'bg');