JSFiddle - React, Tailwind, and code Playground

HTML

<p>MAR/26/2013</p>
<p>Blah</p>

JavaScript

$('p').each(function() {
    var month = $(this).text().match(/[^\/]*/)[0];
    
    var months = {
        MAR: 3
    };
    
    alert(months[month].toString());
});