JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

var $output = $('#output');
var testString = "asdfas ABCD EFGH";
var regex = /^\S+( [A-Z]{4})+$/;

var matches = testString.match(regex);

for(var i=0; matches && i<matches.length; i++){
    if(i > 0){
        $output.append("<br/>");
    }
    $output.append(i+": '");
    $output.append(matches[i]);
    $output.append("'");
}