Fileupload Only Allowing Images?

Oct 26, 2010

<asp:RegularExpressionValidator
id="RegularExpressionValidator1" runat="server"
ErrorMessage="Only images are allowed!"
ValidationExpression="^(([a-zA-Z]:)|(\{2}w+)$?)(\(w[w].*))
+(.jpg|.JPG|.gif|.GIF|.png|.PNG|.jpeg|.JPEG)$"
ControlToValidate="fileUpEx"></asp:RegularExpressionValidator>
<asp:FileUpload ID="fileUpEx" runat="server" />

Whatever file I pick, this throws the validator even if the file is an image file,

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