JSFiddle - React, Tailwind, and code Playground

JavaScript

var foo="Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.Hi all. hello world. Hi all. Hello world.";
var pos = foo.indexOf("Hello");
    while(pos > -1) {
      document.write(pos + "<br />");
       pos = foo.indexOf("Hello", pos+1);
    }