How to I search a number from a name and put it into a filepath

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C#

Hi. I have a project and it requires me to search a number from a name and put it into my filepath. For example:

The name is LU610364G02

and the filepath should be: ..\Reports\2016\10\LU610364\

where 2016 is the 3rd number from LU610364G02, 10 is the 4th and 5th number and LU610364 is the first 8 numbers.

How do I search the values and put it into the filepath?
I am using Microsoft Visual Studio, c#.
Thank you in advance for the help

What I have tried:

Tried using Regex as an expression to match the name to the filepath.

<pre lang="c#"> string Timestamp = string.Empty;
            using (var file = System.IO.File.OpenText(datFile))
            {
                //regexs = regular expressions
                //compile regexs
                //Regex nodeRegex = new Regex("NODE      :(.*)");
                //Regex testModeRegex = new Regex("TEST MODE:(.*)");
                //Regex timestampRegex = new Regex("Timestamp:(.*)");

                Regex nodeRegex = new Regex("NODE      :(.*)", RegexOptions.IgnoreCase);
                Regex testModeRegex = new Regex("\bTest Mode\b", RegexOptions.IgnoreCase);
                Regex program = new Regex("\bPROGRAM\b", RegexOptions.IgnoreCase);
                Regex TimeStamp = new Regex("\bTIMESTAMP\b", RegexOptions.IgnoreCase);

                while (!file.EndOfStream)
                {
                    String line = file.ReadLine();

                    // check name
                    Match m = nodeRegex.Match(line);


                    //string line = "TUI Test Mode: B31P";
                    string match = string.Format(@"\b{0}\b", FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexTestMode);
                    bool matchTestMode = Regex.IsMatch(line, match, RegexOptions.IgnoreCase | RegexOptions.Singleline);
                    Match matchTest = Regex.Match(line, FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexTestMode);
                    Match matchProgram = Regex.Match(line, FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexPROGRAM);
                    Match matchTimestamp = Regex.Match(line, FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexTimestamp);


                    if (matchTest.Success)
                    {
                        int startIndex = matchTest.Index + FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexTestMode.Length + 1;
                        int endIndex = line.IndexOf(' ', startIndex + 1);

                        TestMode = line.Substring(startIndex, endIndex - startIndex).Trim();
                        //break;
                    }

                    if (matchProgram.Success)
                    {
                        int startIndex = matchProgram.Index + FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexTestMode.Length + 1;
                        int endIndex = line.IndexOf(' ', startIndex + 1);

                        strProgram = line.Substring(startIndex, endIndex - startIndex).Trim();
                        //break;
                    }

                    if (matchTimestamp.Success)
                    {
                        int startIndex = matchTimestamp.Index + FAR_Yield_Analysis_Test_Tool.Properties.Settings.Default.RegexTimestamp.Length + 1;
                        int endIndex = line.IndexOf(' ', startIndex + 1);

                        strTimestamp = line.Substring(startIndex, endIndex - startIndex).Trim();
                        //break;