how to replace with regex javascript code example

Example 1: replace regex javascript

const p = 'lazy dog. If the dog reacted, was it really lazy?';
const regex = /Dog/ig;
p.replace(regex, 'ferret')
// output: lazy ferret. If the ferret reacted, was it really lazy?

Example 2: string replace javascript

let re = /apples/gi; 
let str = "Apples are round, and apples are juicy.";
let newstr = str.replace(re, "oranges"); 
console.log(newstr)

output:

"oranges are round, and oranges are juicy."

Example 3: replace javascript

let randomtext = "Random text yo!"
let textRegex = /yo!/;
randomtext.replace(textRegex, "is here.");
console.log(randomtext.replace(textRegex, "is here."));
// Returns Random text is here.