如何验证URL RegularExpressionValidator不是CASE敏感

Question

我试过这样的

<asp:RegularExpressionValidator
    ID="RegularExpressionValidator1"
    runat="Server"
    ControlToValidate="txtWebUrl"
    class="red"
    ValidationExpression="/[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi"
    ErrorMessage="Please enter a valid URL"
    Display="Dynamic"
/>