WPF and string formatting

<Window.Resources>
  <v:MyClass x:Key="whatever" Text="foonbar" />
</Window.Resources>

<TextBlock Text="Hello&#13;World!"/>

<v:MyClass x:Key="whatever">
foo
bar
</v:MyClass>

<TextBlock>
        Line 1
        <LineBreak />
        Line 2
    </TextBlock>

string s = "foo\nbar";
s = s.Replace("\n", "n");

using System.Text.RegularExpressions;

// snip
string s = "foo\nbar";
Regex r = new Regex("\\[rnt\\]");
s = r.Replace(s, ReplaceControlChars); ;
// /snip

string ReplaceControlChars(Match m)
{
    switch (m.ToString()[1])
    {
        case 'r': return "r";
        case 'n': return "n";
        case '\': return "\";
        case 't': return "t";
        // some control character we don't know how to handle
        default: return m.ToString();
    }
}