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

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