replace n g n javascript code example

Example 1: replacing characters in string javascript

var myStr = 'this,is,a,test';
var newStr = myStr.replace(/,/g, '-');

console.log( newStr );  // "this-is-a-test"

Example 2: javascript replace

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"

console.log(p.replace('dog', 'cow'));
// If pattern is a string, only the first occurrence will be replaced.
//output: "cow dog cat rat"