Replace all occurances of a string in a string 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: javascript replaceall

//as of August 2020, not supported on older browsers
str.replaceAll("abc","def")