c# – 无法获得asp：RegularExpressionValidator工作

这是asp：Panel剥离到重要位：

<asp:Panel ID="pnlEmailAddressCollection" runat="server">
    <div id="POMInput-wrapper">
        <div class="POMInput-FieldText">
            <span class="POMInput-wrapper-text">Name:</span>

            <br />
            <span class="POMInput-wrapper-text">Email Address:</span>

            <br />
        </div>
        <div class="POMInput-FieldEntry">
            <asp:TextBox ID="txtEmailAddress" name="emailAddress" runat="server" CssClass="textInput"></asp:TextBox>
            <asp:TextBox ID="txtUserName" runat="server" name="firstName" CssClass="textInput"></asp:TextBox>
        </div>

        <asp:RequiredFieldValidator ID="rfvNameValidator"  runat="server" 
            ErrorMessage="Please enter your name"
            ControlToValidate="txtUserName" 
            Display="None" />

        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
            ErrorMessage="Please enter your email address"
            ControlToValidate="txtEmailAddress" 
            Display="None" />

        <asp:RegularExpressionValidator ID="rfvEmailValidator2" runat="server" 
            ErrorMessage="Please enter a valid email address" 
            ControlToValidate="txtEmailAddress"
            Display="None"
            ValidationExpression="^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}$" />

        <asp:ValidationSummary ID="ValidationSummary1" runat="server"
            ShowMessageBox="true" 
            ShowSummary="false"
            EnableClientScript="true" />                        
    </div>
</asp:Panel>

目前我输入的任何电子邮件都失败了.asp：RequiredFieldValidator正如预期的那样工作.

我在测试项目中测试了正则表达式,并且正则表达式似乎很好(在有效的电子邮件上返回true,在无效的电子邮件上返回false).我是否错误地设置了asp：RegularExpressionValidator？