JavaScript | string.replace()

The string.replace() is an inbuilt function 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 function:
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() function 
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() function 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

My Personal Notes

Recommended Posts:

KANCHAN RAY

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.