JavaScript String replace() Method

In this article, we will tell you how to replace string in javascript(JavaScript String replace() MethodJavaScript String replace() Method). sometimes we need to replace a string with a specified string.

Now, in the following example, we use the replace() method the replace a specified string. so you can see the below syntax.

Syntax
string.replace(searchValue, newValue);

The search value finds in a string, and newValue replaces the existing search value into a string.

Example

var str = "Hello World";
var res = str.replace("World", "John");
console.log(res); //output Hello John

javascript replace multiple occurrences

if you want to replace multiple occurrences in javascript. then you can easily replace using replace() functions. so you can see the following syntax and example for replace multiple occurrences.

Syntax
string.replace(searchValue, newValue).replace(searchValue, newValue)…;

Example

var str = "Hello World";
var res = str.replace("Hello", "John").replace("World", "Doe");
console.log(res); //output John Doe

javascript string replace using regex

If you want to replace multiple occurrences in javascript. then you can easily replace using replace() functions. so you can see the following syntax and example for replace multiple occurrences.

Syntax
string.replace(regexp/substr, newSubStr/function[, flags]);

Example

var str = "Hello World";
var res = /World/gi;
var newstr = str.replace(res, "John");        
console.log(newstr); //output Hello John