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I have an ASP.NET RegularExpressionValidator that checks file extensions. Is there a quick way I can tell it to ignore the case of the extension without having to explicitly add the upper case variants to my validation expression?
ValidationExpression='([^.]+[.](jpg|jpeg|gif|png|wpf|doc|docx|xls|xlsx ...
Server-side, ‘(?i)’ can be used, but this doesn’t work client-side. See here for more discussion and workaround.
i.e. ‘…(?i)(jpg|jpeg|gif|png|wpf|…’