JSFiddle - React, Tailwind, and code Playground

JavaScript

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 msgSplit = msg.split("\n");
msgSplit.forEach(
function append(value) {
    strFinalNTE += value.split("|")[3].toString();

}
)

alert(strFinalNTE);