Question

I have an application which needs to find and then process files which follow a very specific naming convention as follows.

IABC_12345-0_YYYYMMDD_YYYYMMDD_HHMMSS.zip

I cant see any easy way of doing this using a search pattern so Im assuming Ill have to do something like this after I have generated a list of files using a simpler wildcard pattern.

RegEx re = new RegEx("blah");

foreach(FileInfo fi in Directory.GetFiles(path, "I*.zip"))
{
    if(re.IsMatch(fi.Name))
       //blah blah blah
}

Is this the best way of doing this, and if so, how would I form a regular expression to match this file format?

Answer 1

    string pattern = @"I[A-Z]{3}_\d{5}-\d_\d{8}_\d{8}_\d{6}\.zip";
    var matches = Directory.GetFiles(@"c:\temp")
        .Where(path => Regex.Match(path, pattern).Success);

    foreach (string file in matches)
        Console.WriteLine(file); // do something