字符串替换无法正常工作

Question

My problem is:

I have an .ini file that I'm reading as follows:

    StreamReader sr = new StreamReader(txtb_path.Text, Encoding.Default);

    StringBuilder content = new StringBuilder();

    // schreibt Zeile für Zeile auf den StringBuilder bis das Ende der Datei erreicht ist
    while (!sr.EndOfStream)
        content.AppendLine(sr.ReadLine());

    // StringBuilder als String an die TextBox übergeben
    this.textBox1.Text = content.ToString();

Then I apply the following regex:

    string regex = @"^FensterGemerkt.+?\d+\.\d+\.\d+\,\ \d{2}:\d{2}:\d{2}\ :\ -{1}?\d+\,.*?$"; //@"^Fenster.*$";

    RegexOptions options = RegexOptions.Multiline;

    // search in
    string input = content.ToString();
    //txtb_count.Text = "anzahl zeilen: " + Convert.ToString(content.Capacity);

    // run regex
    MatchCollection matches = Regex.Matches(input, regex, options);              

    // MessageBox.Show(Convert.ToString(matches.Count));
    txtb_count.Text = Convert.ToString(matches.Count);
    string cleanup ="";          

    foreach (Match match in matches)
    {
        // clean the ini
        cleanup = Regex.Replace(input, match.Value, "");

        // Output all matches                    
        textBox2.Text = textBox2.Text + "\n" + match.Value;
    }

The .ini file looks like this:

1
FensterGemerkt=12.11.2012, 10:42:37 : -32000,32744--31840,32768
Fenster=-32000,32744,160,24

2
FensterGemerkt=12.11.2012, 10:49:46 : 0,44-1024,768
Fenster=0,44,1024,724

What I want is that if regex matches the first entry:

FensterGemerkt=12.11.2012, 10:42:37 : -32000,32744--31840,32768

... then replace or remove it.

My app works, but only for the last entry in the .ini file. I think I have a problem in my foreach , but I can't figure it out.

Answer 1

There are better ways to do this but the simplest answer to your problem is because you are resetting cleanup to always be the replacement of the last value.

try

    string cleanup =input;          

    foreach (Match match in matches)
    {
        // clean the ini
        cleanup = Regex.Replace(cleanup, match.Value, "");

        // Output all matches                    
        textBox2.Text = textBox2.Text + "\n" + match.Value;
    }

A better solution would be, using Linq:

  Regex regex=new Regex(@"^FensterGemerkt.+?\d+\.\d+\.\d+\,\ \d{2}:\d{2}:\d{2}\ :\ -{1}?\d+\,.*?$"; //@"^Fenster.*$",RegexOptions.MultiLine);
  string cleanup=regex.Replace(input,string.Empty);
  string[] matches=regex.Matches(input).OfType<Match>().Select(m=>m.Value).ToArray();
  txtb_count.Text = Convert.ToString(matches.Length);
  textBox2.Text = string.Join('\n',matches);