How to extract specific part of string from text file ?

Question

string[] files = Directory.GetFiles(@"D:\Text Files\");  
            foreach (string file in files)  
            {  
                var list = GetLinks(File.ReadAllText(file));  
            }  

The GetLinks method :

public List<string> GetLinks(string message)  
        {  
            List<string> list = new List<string>();  
            string txt = message;  
            foreach (Match item in Regex.Matches(txt, @"(http|ftp|https):\/\/([\w\-_]+(?:(?:\.[\w\-_]+)+))([\w\-\.,@?^=%&amp;:/~\+#]*[\w\-\@?^=%&amp;/~\+#])?"))  
            {  
                if (item.Value.Contains("thumbs"))  
                {  
                    list.Add(item.Value);  
                }  
            }  
  
            return list;  
        }  

The result is links like that for example :

https://thumbs.something.com/thumbs/8/2/1/7/7/82177961a502cacfe75.mp4/82177961a502cacfe75.mp4-3.jpg

but i want to get only the first mp4 part :

https://thumbs.something.com/thumbs/8/2/1/7/7/82177961a502cacfe75.mp4

is there a simple way to do it inside the GetLinks method ?

Answer 1

I did it with indexof and substring and it's working fine at least for my case :

public List<string> GetLinks(string message)  
        {  
            List<string> list = new List<string>();  
            string txt = message;  
            foreach (Match item in Regex.Matches(txt, @"(http|ftp|https):\/\/([\w\-_]+(?:(?:\.[\w\-_]+)+))([\w\-\.,@?^=%&amp;:/~\+#]*[\w\-\@?^=%&amp;/~\+#])?"))  
            {  
                if (item.Value.Contains("thumbs"))  
                {  
                    int index1 = item.Value.IndexOf("mp4");  
                    if (index1 != -1)  
                    {  
                        string result = item.Value.Substring(0, index1 + 3);  
                        list.Add(result);  
                    }  
                }  
            }  
  
            return list;  
        }