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Pattern searching for file extensions in c#

Posted on 2013-10-27
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Last Modified: 2013-11-21
I have to go through a set of files and see if the extension meets a specific pattern.
Below is the pattern of files that I am currently looking for:

"*.pst *.ost *.e0* *.l0* *.ghs *.gho *.7z *.7z.* *.exp *.ilk *.res *.trg *.tlh *.idb *.pdb *.pch *.opt *.lib *.cab *.mov *.psp *.bmp *.chi *.chm *.com *.dll *.exe *.gif *.png *.hlp *.ivi *.ivt *.ix *.msi *.nls *.obj *.ocx *.rmi *.sys *.tif *.tmp *.ttf *.vbx *.wav *.wpg DRVSPACE.* *.iso *.pdb *.mpeg *.mpg *.ram *.rm *.ai *.aif *.aiff *.bin *.hqx *.snd *.mpe *.wmv *.wma *.xfd *.db *.m4v"

I know Directory.GetFiles has a pattern option.  However it will only let me specify one at a time.  I would like to go through each file individually, then check the extension then do any needed reporting on it.

Any input would be greatly appreciated.
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Question by:rye004
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LVL 56

Expert Comment

by:Julian Hansen
ID: 39604904
Here is some code that might get you started. Fill out the rest of the extensions as needed. This assumes your files are in the top folder only - a recursive solution to process subfolders would be needed to do subfolders as well
using System;
using System.IO;
using System.Text.RegularExpressions;

namespace _28278557
{
  class MatchExtensions
  {
    static void Main(string[] args)
    {
      string folderPath = @"G:\foldername";
      string [] wildcard = {"[.+].pst", "[.+].txt", "[.+].xls", "[.+].msg"};

      foreach (string file in Directory.GetFiles(folderPath, "*.*"))
      {
        Console.Write("File: " + file);
        foreach(string wc in wildcard) 
        {
          Match match = Regex.Match(file, wc);
          if (match.Success) 
          {
            Console.WriteLine ("Matched on " + wc);
          }
          else 
          {
            Console.WriteLine("No Match");
          }
        }
      }
      Console.WriteLine ("Done");
    }
  }
}

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Author Comment

by:rye004
ID: 39612713
julianH,

Thank you for your posting, it is greatly appreciated.  For the most part I got the code working.  It iterates through the array with no issues.  My only problem is the regular expression does not seem to work.  Would you mind giving me additional input on the regular expression?

Many thanks!
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Author Comment

by:rye004
ID: 39612785
I think I just figured it out.  I tried the following and it worked:

{ @"^.*\.dll", @"^.*\.exe", @"^.*\.cab", @"^.*\.htm" };
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LVL 56

Expert Comment

by:Julian Hansen
ID: 39613363
(apologies for not posting earlier - did not pick up your earlier post)

That is odd - the code I posted worked fine with the regex I used there.


Your regex is using match 0 or more (*) as opposed to 1 or more + and is including the ^ to match from the beginning.

I will look at the code I posted again and post back.
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Author Comment

by:rye004
ID: 39613369
Thanks!  Your time is greatly appreciated!
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Author Comment

by:rye004
ID: 39636629
curious, did have a sec to look at this?

Many thanks!
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LVL 56

Accepted Solution

by:
Julian Hansen earned 250 total points
ID: 39640964
Apologies for long time replying - was locked up on a project.

Try this code
using System;
using System.IO;
using System.Text.RegularExpressions;

namespace _28278557
{
	class MatchExtensions
	{
		static void Main(string[] args)
		{
			string folderPath = @"G:\Working Directory";
			string [] wildcard = {@"(.+)\.pst", @"(.*)\.txt", @"(.+)\.xls", @"(.+)\.msg"};
			bool matched = false;

			foreach (string file in Directory.GetFiles(folderPath, "*.*"))
			{
				Console.Write("File: " + file);
				matched = false;
				foreach(string wc in wildcard) 
				{
					Match match = Regex.Match(file, wc);
					if (match.Success) 
					{
						matched = true;
						Console.WriteLine (" MATCHED on " + wc);
					}
				}

				if (!matched) 
				{
					Console.WriteLine(" No Match");
				}
			}
			Console.WriteLine ("Done");
		}
	}
}

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Author Closing Comment

by:rye004
ID: 39666414
Thank you so much for this.  I understand getting locked up on a project – I have been in the same situation.

So far, this seems to work well.  I will continue playing with it.

Thanks again!
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LVL 56

Expert Comment

by:Julian Hansen
ID: 39668155
You are welcome - thanks for the points
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