Problem with RegularExpressionValidator and Firefox 3.0.7 - 3.0.8

Hi,

I use a RegularExpressionValidator with a FileUpload :

... ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.jpg|.JPG|.jpeg|.JPEG|.bmp|.BMP|.gif|.GIF)$" ...

It works nice with many browsers but not with Firefox 3.0.7 and 3.0.8

What's the problem?

Thanks
...