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.

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<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>

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Output:


        
          
          
          
        

            

gfg is a CS portal


Code #2:











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<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> 



















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Output:


gfg is a CS portal



          
          
          
          

            

    

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