JSFiddle - React, Tailwind, and code Playground

HTML

<p id="output"></p>

JavaScript

String.prototype.HlCodeToArray = function (){
    var output = [];
    var msgSplit = this.split("\n");
    output = msgSplit.map(function(value) {
            return value.split("|");
        });
    return output;
};

var msg = "NTE|1|T| Hi|\n"
+"NTE|2|T| this|\n"
+"NTE|3|T| is|\n"
+"NTE|4|T| really|\n"
+"NTE|5|T| annoying|\n"
+"NTE|6|T| me|";

var strFinalNTE = '';

var msgArray = msg.HlCodeToArray();
msgArray.forEach(
function(value) {
    strFinalNTE += value[3].toString();

}
);

document.getElementById('output').innerHTML = strFinalNTE;