lastIndexOf (JavaScript Array Method)

const tnwText = "Hello, welcome to TNW (Web Service & ICT Solutions)";

function tnwFun1(){
    document.getElementById("demo").innerHTML = tnwText;
}

function tnwFun2(){
    let tnwSearch = document.getElementById("search").value;
    let result = tnwText.lastIndexOf(tnwSearch);
    document.getElementById("demo").innerHTML = "The search text is found at : " + result;
}