Regex for email validation JavaScript

In this post we will see how to validate email format in Javascript using regular expression. We can use regular expression (/^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$/i) to validate the email address in javascript.

Regular expression to validate email format in JavaScript

Example of email validation using regex in javascript

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title>Regex to validate email format in JavaScript</title>
  <script language="javascript" type="text/javascript">
    function Validate() {
      var emailRegex = new RegExp(/^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$/i);
      var emailAddress = document.getElementById("<%= txtemail.ClientID %>").value;
      var valid = emailRegex.test(emailAddress);
      if (!valid) {
        alert("Invalid e-mail address");
        return false;
      } else
        return true;
    }
  </script>
</head>
<body>
  <form id="form1" runat="server">
  <div>
    <asp:TextBox runat="server" ID="txtemail"></asp:TextBox>
    <asp:Button runat="server" ID="Send" OnClientClick="return Validate();" Text="Send" />
  </div>
  </form>
</body>
</html>

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