replace in js regex code example

Example 1: replace all occurrences of a string in javascript

const p = 'dog dog cat rat';

const regex = /dog/gi;

console.log(p.replace(regex, 'cow'));
//if pattern is regular expression all matches will be replaced
//output: "cow cow cat rat"

Example 2: 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 3: javascript regex replace

const search = 'duck'
const replaceWith = 'goose';

const result = 'duck duck go'.replaceAll(search, replaceWith);

result; // => 'goose goose go'