JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/ui-lightness/jquery-ui.css">
<span id="MYSPAN"></span>

JavaScript

var data = " STDERR:SNO NOT VALID ";

if(data.substring(0,7) == ' STDERR'){
    $("#MYSPAN").text(data.substring(8));
} else {
    $("#MYSPAN").text(data);
}