JavaScript | exec() Method

The exec() Method in JavaScript is used to test for match in a string. If there is a match this method returns the first match else it returns NULL.

Syntax: 

RegExpObject.exec(str)

Where str is the string to be searched. This is required field.
Example-1: This example searches for the string “computer” in the original string.

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<!DOCTYPE html>
<html>
  
<body style="text-align:center">
    <h1 style="color:green">
      GeeksforGeeks
  </h1>
    <h2>exec() Method</h2>
    <p>
      String: GeeksforGeeks is the 
      computer scince portal for geeks.
  </p>
    <button onclick="geek()">
      Click it!
  </button>
    <p id="app"></p>
    <script>
        function geek() {
            var str =
                "GeeksforGeeks is the "+
                "computer science portal for geeks.";
            
            var regex = new RegExp("computer", );
            // match "computer" in string.                       
            var rex = regex.exec(str);
            document.getElementById("app").innerHTML =
                " Found " + rex.length + " match: " + rex;
        }
    </script>
</body>
  
</html>

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Output: 

Before clicking the button: 

exec

After clicking the button: 

exec


Example-2: This example searches for the string “rep” in the original string.













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<!DOCTYPE html> 


<html> 


  


<body style="text-align:center"> 


    <h1 style="color:green"> 


      GeeksforGeeks 


  </h1> 


    <h2> 


      exec() Method 


  </h2> 


    <p> 


      String: GeeksforGeeks  


      is the computer scince  


      portal for geeks. 


  </p> 


    <button onclick="geek()"> 


      Click it! 


  </button> 


    <p id="app"></p> 


    <script> 


        function geek() { 


            var str =  


                "GeeksforGeeks is the"+ 


                " computer science "+ 


                "portal for geeks."; 


            var regex = new RegExp("rep"); 


            


            // Match "rep" in string. 


            var rex = regex.exec(str); 


            alert(rex); 


        } 


    </script> 


</body> 


  


</html> 



















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 Output: 

 Before clicking the button: 

exec

 After clicking the button: 

exec


Supported Browsers: The browsers supported by JavaScript exec() Method are listed below:


    

  • Google Chrome
    • 

  • Apple Safari
    • 

  • Mozilla Firefox
    • 

  • Opera
    • 

  • Internet Explorer
    • 



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