JavaScript string.replace() Method

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

• Example:
  

javascript

<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. 

javascript

<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:

javascript

<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 1 and above
• Edge 12 and above
• Firefox 1 and above
• Internet Explorer 5.5 and above
• Opera 4 and above
• Safari 1 and above