Splitting a file name with multiple delimiters

Question

How would I split this file name. image-1.png-ad-en-Km-Image.txt so that the end result looks like this. (also to ignore the '.txt' at the end).

image-1.png
ad
en
Km
Image

In other words I want to ignore the first hyphen (-). The first 'segment' will always end with .png or .jpg.

I would usually do it something like this but that first hyphen in the image name is throwing a bit of a spanner in the works.

 var endOfName = name.LastIndexOf(".txt"); var names = name.Substring(0, endOfName).Split('-');

Split takes an array of characters : input.Split(new char[] {'-','.'}).ToArray(); — jdweng
– jdweng, Commented May 26, 2021 at 15:42

Dmitrii Bychenko · Accepted Answer · 2021-05-26 15:54:31Z

It seems, that you are working with files' names, that's why I suggest using Path class to manipulate with names and extensions:

 using System.IO; .. string source = "image-1.png-ad-en-Km-Image.txt"; // get rid of ".txt" string name = Path.GetFileNameWithoutExtension(source); // split extension ".png-ad-en-Km-Image" into {".png", "ad", "en", "Km", "Image"} string[] items = Path.GetExtension(name).Split('-'); // Add file name "image-1" to the 1st item items[0] = Path.GetFileNameWithoutExtension(name) + items[0];

Let's have a look:

 Console.WriteLine(string.Join(Environment.NewLine, items));

Outcome:

image-1.png ad en Km Image

Please, note, that even for elaborated files' names like

string source = "my.image-1-2-3.png-ad-en-Km-Image.txt";

we'll have

my.image-1-2-3.png # <- valid file name ad en Km Image

Tommaso Bertoni · Accepted Answer · 2021-05-26 16:04:12Z

If the pattern of the filename is constant, you can use the following function:

static List<string> GetNames(string filename) { var segments = filename.Split('.'); // The second segment contains all the "-" delimited tokens // including the extension of the first segment (png/jpg) var others = segments[1].Split('-'); var firstName = $"{segments[0]}.{others.First()}"; var names = new List<string> { firstName }; // Add all but the first element, since it's part of firstName names.AddRange(others.Skip(1)); // If you wanted to add the final ".txt", you'd simply: // names.Add($".{segments[2]}"); return names; } static void Main() { var filename = "image-1.png-ad-en-Km-Image.txt"; var names = GetNames(filename); // image-1.png, ad, en, Km, Image }

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