how to replace character in string in js code example

Example 1: js replace characters in a string

var str = "Original string!";
var str = str.replace("Original", "New");

Example 2: replace in string javascript

const p = 'hello world ! hello everyone ! ';

const regex = /hello/gi;

console.log(p.replace(regex, 'good morning'));
// expected output: "good morning world ! good morning everyone !"

console.log(p.replace('hello', 'good evening'));
// expected output: "good evening world ! hello everyone !"