How to validate email address using RegExp in JavaScript ? ❤️

Given an email id and the task is to validate the email id is valid or not. The validation of email is done with the help of Regular Expressions.

Approach 1:

RegExp – It checks for the valid characters in the Email-Id (like, numbers, alphabets, few special characters.)
It is allowing every special symbol in the email-id (like, !, #, $, %, ^, &, *) symbols in the Email-Id but not allowing the second @ symbol in ID.

Example: This example implements the above approach.

<!DOCTYPE html>  
<html>  
  
<head>  
    <title>  
        How to validate email address 
        using RegExp in JavaScript ? 
    </title>  
</head> 
  
<body style = "text-align:center;">  
      
    <h1 style = "color:green;">  
        w3wiki  
    </h1>  
      
    <p id = "GFG_UP" style =  
            "font-size: 15px; font-weight: bold;">  
    </p> 
      
    <button onclick = "GFG_Fun()">  
        click here  
    </button>  
      
    <p id = "GFG_DOWN" style =  
        "font-size: 24px; font-weight: bold; color: green;">  
    </p>  
      
    <script>  
        var up = document.getElementById('GFG_UP');  
        var down = document.getElementById('GFG_DOWN');  
        var email = 'w3wiki@gmail.com'; 
          
        up.innerHTML = "Click on the button to check the " 
                    + "validity of Email Id.<br>" + email;  
          
        function isEmail(email) { 
              
            // Regular Expression (Not accepts second @ symbol 
            // before the @gmail.com and accepts everything else) 
            var regexp = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; 
              
            // Converting the email to lowercase 
            return regexp.test(String(email).toLowerCase()); 
        } 
          
        function GFG_Fun() {  
            down.innerHTML = isEmail(email); 
        }  
    </script>  
</body>  
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

Approach 2:

RegExp – It checks for the pattern like anything@anything.anything
Not like the previous example, RegExp is accepting every character along with special character multiple times.

Example 2: This example implements the above approach.

<!DOCTYPE HTML>  
<html>  
  
<head>  
    <title>  
        How to validate email address 
        using RegExp in JavaScript ? 
    </title>  
</head> 
  
<body style = "text-align:center;">  
      
    <h1 style = "color:green;">  
        w3wiki  
    </h1>  
      
    <p id = "GFG_UP" style =  
            "font-size: 15px; font-weight: bold;">  
    </p> 
      
    <button onclick = "GFG_Fun()">  
        click here  
    </button>  
      
    <p id = "GFG_DOWN" style =  
        "font-size: 24px; font-weight: bold; color: green;">  
    </p>  
      
    <script>  
        var up = document.getElementById('GFG_UP');  
        var down = document.getElementById('GFG_DOWN');  
        var email = 'Gee%E^%ksForBeginner@gmail.com'; 
          
        up.innerHTML = "Click on the button to check the " 
                +   "validity of Email Id.<br>" + email;  
          
        function isEmail(email) { 
              
            // Regular Expression (Accepts every special 
            // character along with @ symbol) 
            var regexp = /\S+@\S+\.\S+/; 
              
            // Converting the email to lowercase 
            return regexp.test(String(email).toLowerCase()); 
        } 
          
        function GFG_Fun() {  
            down.innerHTML = isEmail(email); 
        }  
    </script>  
</body>  
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

How to validate email address using RegExp in JavaScript ?

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