dknaack dknaack - 1 year ago 104
C# Question

Regex: Extract Artist and Title from Filename

I have different filenames which contains Tracknumber, Album, Artist and Title.
They dont always have the same format. Now i want to extract things linke Artist and Title from that strings.

I created and found many implementations but i was not able to get this to work reliable for the different formats. Sometimes the information is even in the Directoryname etc.

I dont expect that one regex could solve all problems. So i found that 3 different types exists.

Sample Filenames

First: All Information inside the Filename

01. Artist - Title.m4a
01: Artist - Title.aif
01 Artist - Title.mp3
Artist - Title.mp3

Second: Information inside the Filename and Directoryname

/Artist - Album/01. Title.aif
/Artist - Album/01: Title.m4a
/Artist - Album/01 Title.mp3
/Artist - Album/Title.mp3

Third: Information inside the Filename, Directoryname and Parents Directoryname

/Artist/Album/01. Title.mp3
/Artist/Album/01: Title.m4a
/Artist/Album/01 Title.mp3

Answer Source

I did it in one Regex (well using '|')

using System;
using System.Globalization;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication7
    class Program
        static void Main(string[] args)
            string[] inputs = {
                "01. Artist - Title.m4a",
                "01: Artist - Title.aif",
                "01 Artist - Title.mp3",
                "Artist - Title.mp3",
                "/Artist - Album/01. Title.aif",
                "/Artist - Album/01: Title.m4a",
                "/Artist - Album/01 Title.mp3",
                "/Artist - Album/Title.mp3",
                "/Artist/Album/01. Title.mp3",
                "/Artist/Album/01: Title.m4a",
                "/Artist/Album/01 Title.mp3",

            string pattern =
                @"^\d*[\.:]{0,1}\s*(?'artist'[^/][^-]+)\s+-\s+(?'title'[^\.]+)" +
                "|" +
                @"^/(?'artist'[^-]+)-\s+(?'album'[^/]+)/\d*[\.:]{0,1}\s*(?'title'[^\.]+)" +
                "|" +

            foreach (string input in inputs)
                Match match = Regex.Match(input, pattern);
                Console.WriteLine("Artist : {0}, Album : {1}, Title : {2}",
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