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Email validation using JavaScript

  1. <script language = "javascript" >  
  2.     function checkEmail() {  
  3.         var email = document.getElementById('txtEmail');  
  4.         var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;  
  5.         if (!filter.test(email.value)) {  
  6.             alert('Please provide a valid email address');  
  7.             email.focus;  
  8.             return false;  
  9.         }  
  10.     }   
  11. < /script> 
Take a textbox and button in your aspx page and call the JavaScript function on button click.
  1. <input type='text' id='txtEmail'/>  
  2. <input type='submit' name='submit' onclick='Javascript:checkEmail();'/>