Asp.Net Regular Expression Example

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">

    <asp:TextBox ID="TextBox1" runat ="server" >
    </asp:TextBox>

    <asp:RegularExpressionValidator ID="re1" runat ="server" ControlToValidate ="TextBox1" ErrorMessage ="Invalid Mail"
     ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>

    <br />
    <asp:Button ID="Button1" runat ="server" Text ="Check" />

    </form>
</body>
</html>

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