Validation ASP.Net Tutorial

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  4. RegularExpressionValidator compares value against a regular expression
<%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


    Show RegularExpressionValidator


    
    

            id="lblEmail"
        Text="Email Address:"
        AssociatedControlID="txtEmail"
        Runat="server" />
            id="txtEmail"
        Runat="server" />
            id="regEmail"
        ControlToValidate="txtEmail"
        Text="(Invalid email)"
        ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
        Runat="server" />
    
            id="btnSubmit"
        Text="Submit"
        Runat="server" />