Regular expressions in asp.net

asp:FileUpload Control <asp:FileUpload ID="FileUpload7" runat="server" size="12" CssClass="inputcd" /> Only JPG, GIF, PNG allowed  ValidationExpression="(.*\.([jJ][pP][gG]|[gG][iI][fF]|[pP][nN][gG])$)" Only JPG  allowed ValidationExpression="^.*\\.((j|J)(p|P)(e|E)?(g|G)|(j|J)(p|P)(g|G))$" Only .mp3 & .wma file format allowed ValidationExpression="^.*\\.((m|M)(p|P)(3|3)|(w|W)(m|M)(a|A))$" Only .mp4, .avi, .flv, .wmv, .mov  file format allowed ValidationExpression="^.*\\.((m|M)(p|P)(4|4)|(a|A)|(v|V)(i|I)|(f|F)(l|L)(v|V)|(w|W)(m|M)(v|V)|(m|M)(o|O)(v|V))$" <asp:RegularExpressionValidator...

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