Problem in regular expression parsing - Unrecognized grouping construct.

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ASP.NET

Hello everyone

I am trying a regular expression for the FTP Server List Formats (e.g. drwxr-xr-x 1 ftp ftp 0 Mar 15 2010 .Test Folder11). but my regular expression gives me this error :

parsing

"(?(?\d+-\d+-\d+)\s+)(?\d+\:\d+(AM|PM))\s*)(?((?\)|(?\d+))\s*)(?\w+))"

- Unrecognized grouping construct.

The original regular expression is :

@"(?" + @"(?\d+-\d+-\d+)\s+)" + 

                @"(?\d+\:\d+(AM|PM))\s*)" + 

                @"(?((?\)|(?\d+))\s*)" +

                @"(?\w+))",

RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.IgnorePatternWhitespace

                | RegexOptions.Compiled

please suggest some regular expression or solution for this problem.