How to find the word of given paragraph using javascript?

Html  page:

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

JavaScript Page:

<script>

function myFunction()

{

    var str = "Hello world, welcome to the universe.";

    var n = str.includes("world");

    document.getElementById("demo").innerHTML = n;

}

</script>

Output:

Ture