Question

I have a situation where I am given a text file with text formatted as follows:

C:\Users\Admin\Documents\report2011.docx: My Report 2011
C:\Users\Admin\Documents\newposter.docx: Dinner Party Poster 08

How would it be possible to trim the text file, so to trim the “:” and all characters after it.

E.g. so the output would be like:

C:\Users\Admin\Documents\report2011.docx
C:\Users\Admin\Documents\newposter.docx




Current Code:

        private void button1_Click(object sender, EventArgs e)
        {

            using (StreamWriter sw = File.AppendText(@"c:\output.txt"))
            {
                StreamReader sr = new StreamReader(@"c:\filename.txt");
                Regex reg = new Regex(@"\w\:(.(?!\:))+");
                List<string> parsedStrings = new List<string>();

                while (sr.EndOfStream)
                {
                    sw.WriteLine(reg.Match(sr.ReadLine()).Value);
                }
            }

        }

Not working 🙁

Answer 1

int index = myString.LastIndexOf(":");
if (index > 0)
   myString= myString.Substring(0, index);

Edit – Added answer based on modified question. It can be condensed slightly, but left expanded for clarity of what’s going on.

 using (StreamWriter sw = File.AppendText(@"c:\output.txt"))
 {
      using(StreamReader sr = new StreamReader(@"input.txt"))
      {                    

          string myString = "";
          while (!sr.EndOfStream)
          {

                myString = sr.ReadLine();
                int index = myString.LastIndexOf(":");
                if (index > 0)
                    myString = myString.Substring(0, index);

                sw.WriteLine(myString);
           }
       }
  }