Question

I am getting a string message through an event and I am putting it in a TextBox.
Unfortunatelly, this message has many empty lines. How do I replace two empty lines with one?

My first thought is for something like this:

string newLine = Environment.NewLine;
textbox.text = msg.Replace(newLine + newLine, newLine);

I am sure there is a better way to accomplish this.

Answer 1

But your String.Replace solution won’t work if there are three newlines in a row. For example, consider:

string s = "hello\n\n\n\n\n\n\n\n\n\n\n\nworld";
string s1 = s.Replace("\n\n", "\n");
string s2 = Regex.Replace(s, "\\n{2,}", "\n");

s1 will have multiple \n characters in it. s2 will have only one.

This is using \n as an example, but the same thing applies if you’re using Environment.NewLine (i.e. \r\n).