JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test">Foo</div>

JavaScript

function stringFormat(str, arr) {
   for (var i = 0; i < arr.length; i++) {
        var regExp = new RegExp('^\{' + i + '\}$', 'g');
        str = str.replace(regExp, arr[i]);   
    }
    return str;  
}

var str = '<p>The quick {0}, brown {1}</p>';

$('#test').html(stringFormat(str, ['brown', 'fox']));