How to replace space as a newline in a textBox with Multiline property set to true?

Question

Suppose I have this string:

string str = \"The quick brown fox     jumps over the lazy dog\";

How can I replace or ignore the spaces in the str

Answer 1

textBox.Text = String.Join(Environment.NewLine, str.Split(new char[] {' ' }, StringSplitOptions.RemoveEmptyEntries));

UPDATE: Of course, StringSplitOptions.RemoveEmptyEntries should be used.

UPDATE2: alternative version via regular expression

textBox.Text = Regex.Replace(str, @"\s+", Environment.NewLine);