CODEWITHSUNDEEP
c#regex
user3841666
user3841666

Reputation: 1

How to use Regex to filter file names in c#?

 Regex reg = new Regex(@"^[0-9]*\.wav");
  Stack<string> wavefiles= new Stack<string>(Directory.GetFiles("c:\\WaveFiles", "*.wav").Where(path => reg.IsMatch(path)));

what I am trying to do in the above code is to get all the wave files with names having only digits. for example "123.wav"

when I try the above code it does not return any files ?

any ideas what is wrong with my code?

Upvotes: 0

Views: 2826

Answers (4)

user3841666
user3841666

Reputation: 1

Regex reg = new Regex(@"^[0-9].wav"); wavefiles = new Stack(Directory.GetFiles(FolderName, ".wav").Where(path => reg.IsMatch(Path.GetFileName(path))));

Upvotes: 0

EZI
EZI

Reputation: 15354

You can also do it without Regex

var files = Directory.GetFiles("c:\\WaveFiles", "*.wav")
            .Where(f => Path.GetFileNameWithoutExtension(f).All(char.IsDigit));

Upvotes: 3

Fred Kleuver
Fred Kleuver

Reputation: 8037

Directory.GetFiles gives you a list of file names including the paths. You are trying to match your regex on results like this: "C:\WaveFiles\123.wav".

You are expecting this entire string to start with a digit, and then contain only digits up to the ".wav" part, which of course won't match any of your files.

You might also want to replace [0-9] by \d for digits but that's a matter of preference.

Try this:

Regex reg = new Regex(@"^\d+\.wav");

string[] waveFilePaths = Directory.GetFiles("C:\\WaveFiles", "*.wav");

Stack<string> filesWithOnlyDigits = new Stack<string>(waveFilePaths 
    .Where(path => reg.IsMatch(Path.GetFileName(path))));

Upvotes: 1

Joel Rondeau
Joel Rondeau

Reputation: 7586

Your regex string is a little off, but not bad. I'd really do

Regex(@"^\d+\.wav$");

Which will match all file names that have one or more digits as their name and wav as their extension.

The real issue here is that all of your strings start with C:\WaveFiles\ which is why your regex is failing.

You will want to add a line to get the filename from the full path:

Path.GetFilename(path);

Upvotes: 0

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