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Regular Expression for doc pdf docs xls xlxs rar zip or any Other

For file extension Regular expression can be made very simply.

(.*\.([Pp][Dd][Ff])$)  For pdf

For two like pdf and zip both

(.*\.([Pp][Dd][Ff])|.*\.([Zz][Ii][Pp])$)

Like same we can create for all

(.*\.([Pp][Dd][Ff])|.*\.([Zz][Ii][Pp])|.*\.([Rr][Aa][Rr])|.*\.([Xx][Ll][Ss][Xx])|.*\.([Xx][Ll][Ss])|.*\.([Dd][Oo][Cc])|.*\.([Dd][Oo][Cc][Xx])$) For pdf zip rar xlsx xls doc docx

Can be used in regular expression in file upload control in asp.net as follow :--

  <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="FileUpload1"
                                                ErrorMessage="Only .zip, .rar, .xlsx, .xls, .pdf, .doc, .docx files are allowed" ValidationExpression="(.*\.([Pp][Dd][Ff])|.*\.([Zz][Ii][Pp])|.*\.([Rr][Aa][Rr])|.*\.([Xx][Ll][Ss][Xx])|.*\.([Xx][Ll][Ss])|.*\.([Dd][Oo][Cc])|.*\.([Dd][Oo][Cc][Xx])$)"
                                                Display="Dynamic" ValidationGroup="submit"></asp:RegularExpressionValidator>


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