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JavaScript replace() Method


String Object Reference Complete String Object Reference

Definition and Usage

The replace() method is used to replace some characters with some other characters in a string.

This method supports regular expressions. You can learn about the RegExp object in our JavaScript tutorial.

Syntax

stringObject.replace(findstring,newstring)

Parameter Description
findstring Required. Specifies a string value to find. To perform a global search add a 'g' flag to this parameter and to perform a case-insensitive search add an 'i' flag
newstring Required. Specifies the string to replace the found value from findstring


Tips and Notes

Note: The replace() method is case sensitive.


Example 1 - Standard Replace

In the following example we will replace the word Microsoft with W3Schools:

<script type="text/javascript">
var str="Visit Microsoft!";
document.write(str.replace(/Microsoft/, "W3Schools"));
</script>

The output of the code above will be:

Visit W3Schools!

Note: In the following example the word Microsoft will not be replaced (because the replace() method is case sensitive):

<script type="text/javascript">
var str="Visit Microsoft!";
document.write(str.replace(/microsoft/, "W3Schools"));
</script>

The output of the code above will be:

Visit Microsoft!


Example 2 - Case-insensitive Search

In the following example we will perform a case-insensitive search, and the word Microsoft will be replaced:

<script type="text/javascript">
var str="Visit Microsoft!";
document.write(str.replace(/microsoft/i, "W3Schools"));
</script>

The output of the code above will be:

Visit W3Schools!


Example 3 - Global Search

In the following example we will perform a global match, and the word Microsoft will be replaced each time it is found:

<script type="text/javascript">
var str="Welcome to Microsoft! ";
str=str + "We are proud to announce that Microsoft has ";
str=str + "one of the largest Web Developers sites in the world.";
document.write(str.replace(/Microsoft/g, "W3Schools"));
</script>

The output of the code above will be:

Welcome to W3Schools! We are proud to announce that W3Schools
has one of the largest Web Developers sites in the world.


Example 4 - Global and Case-insensitive Search

In the following example we will perform a global and case-insensitive match, and the word Microsoft will be replaced each time it is found, independent of upper and lower case characters:

<script type="text/javascript">
var str="Welcome to Microsoft! ";
str=str + "We are proud to announce that Microsoft has ";
str=str + "one of the largest Web Developers sites in the world.";
document.write(str.replace(/microsoft/gi, "W3Schools"));
</script>

The output of the code above will be:

Welcome to W3Schools! We are proud to announce that W3Schools
has one of the largest Web Developers sites in the world.


Try-It-Yourself Demos

replace()
How to use replace() to replace some characters in a string.

replace() Case-insensitive search
How to use replace() with the 'i' flag to replace some characters in a string.

replace() Global search
How to use replace() with the 'g' flag to replace some characters in a string.


String Object Reference Complete String Object Reference

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