EMail Validation using jQuery with Regular Expression | How to do EMail validation using jQuery <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> <title></title> <script type="text/javascript"> $(document).ready(function () { $('#btnSubmit').click(function () { var inputEmail = $("#txtEmail").val(); var emailRegularExpression = /^(^([0-9a-zA-Z]+([_.-]?[0-9a-zA-Z]+)*)@[0-9a-zA-Z]+([_.-]?[0-9a-zA-Z])*.[a-zA-Z]{2,4})+$/; if (!emailRegularExpression.test(inputEmail)) { $('#ErrorMessage').html('Invalid Email Address'); } }); }); </script> </head> <body> <input type="text" id="txtEmail" /> ..