JavaScript string.replace() Method

Difficulty Level : Basic
Last Updated : 01 Mar, 2021

Below is the example of the string.replace() Method.

Example:

<script>
    var string = 'GeeksForGeeks';
    var newstring = string.replace(/GeeksForGeeks/, 'GfG');

    document.write(newstring);
</script>
Output:
```
GfG
```

The string.replace() is an inbuilt method in JavaScript which is used to replace a part of the given string with some another string or a regular expression. The original string will remain unchanged.

Syntax:

str.replace(A, B)

Parameters: Here the parameter A is regular expression and B is a string which will replace the content of the given string.

Return Values: It returns a new string with replaced items.

JavaScript code to show the working of this method:
Code #1:
Here the contents of the string GeeksForGeeks will be replaced with gfg.

<script>
  
    // Assigning a string
    var string = 'GeeksForGeeks is a CS portal';
  
// Calling replace() method
var newstring = string.replace(/GeeksForGeeks/, 'gfg');
  
// Printing replaced string
document.write(newstring);
  
</script>

Output:

gfg is a CS portal

Code #2:

<script>
  
    // Taking a regular expression
    var re = /GeeksForGeeks/;
  
// Taking a string as input
var string = 'GeeksForGeeks is a CS portal';
  
// Calling replace() method to replace
// GeeksForGeeks from string with gfg
var newstring = string.replace(re, 'gfg');
  
// Printing new string with replaced items
document.write(newstring);
  
</script>

Output:

gfg is a CS portal

Supported Browsers:

Google Chrome
Internet Explorer
Firefox
Apple Safari
Opera

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