JavaScript Replace String Function – Examples

JavaScript Replace String Function – Examples

In this tutorial, we would love to demonstrate to you, how you can replace the string in javaScript.

JavaScript String Replace

The JavaScript string replace() method is used to replace a part of a given string with a new sub-string. This method searches for specified regular expression in a given string and then replace it if the match occurs.

Here you will learn how to use a global search modifier with replace() method. It will replace all the match elements otherwise the method replaces only the first match. JavaScript also provides an ignore flag to make the method case-insensitive.


The replace() method is represented by the following syntax:


Parameter of Replace() Method

orgStr– It represents the string to be searched and replaced.

newStr– It represents the new string that replaced with the searched string.

List of JavaScript String replace() Method Examples

Let’s take some examples of replace() method.

Example 1 – Replace Sub-String

Let’s take a simple example to replace a substring.

  var str="hello world";  


hello world!

Example 2 – Global Search Modifier

In this example, we will replace a regular expression using the global search modifier.

  var str=" Learn PHP on";  


Learn javaScript on

Example 3 – Without using Global Search

In this example, we will replace a regular expression without using a global search.

var str=" Learn Node.js on Node.js is a well-known JavaScript framework.";   document.writeln(str.replace(/Node.js/,"AngularJS")); //It will replace only first match.   


Learn AngularJS on Node.js is a well-known JavaScript framework

Example 4 – Replace() Method is Case-Sensitive

In this example, we will see that the replace() method is case-sensitive.

var str=" Learn Node.js on";   document.writeln(str.replace(/Node.JS/g,"AngularJS"));   


Learn Node.js on

Example 5 – Replace() Method is Case-Sensitive Ignore

We can ignore the case-sensitive behavior of replace() method by using the ignore flag modifier. Let’s understand with the help of an example:

var str=" Learn Node.js on";  


Learn AngularJS on


In this tutorial, you have learned how to replace the string in javaScript using the replace() method.

AuthorTuts Make

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Javascript, JQuery, Laravel, Livewire, Codeigniter, Vue JS, Angular JS, React Js, WordPress, and Bootstrap from a starting stage. As well as demo example.

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