Using Directory.GetFiles with a regex in C#?

Question

I have this code:

string[] files = Directory.GetFiles(path, "......", SearchOption.AllDirectories) 

What I want is to return only files which do NOT start with p_ and t_ and have the extension png or jpg or gif. How would I do this?

Answer 1

Directory.GetFiles doesn't support RegEx by default, what you can do is to filter by RegEx on your file list. Take a look at this listing:

Regex reg = new Regex(@"^^(?!p_|t_).*");  var files = Directory.GetFiles(yourPath, "*.png; *.jpg; *.gif")                      .Where(path => reg.IsMatch(path))                      .ToList(); 

Answer 2

You can't stick a Regex into the parameter, it's just a simple string filter. Try using LINQ to filter out afterwards instead.

var files = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories)             .Where(s => s.EndsWith(".jpg") || s.EndsWith(".png"))             .Where(s => s.StartsWith("p_") == false && s.StartsWith("t_") == false)