title: Make the first 4 characters in a richedit line bold
body: <p>How can I make the first 4 characters in a line I am going to add bold?<br>
  Example:</p>
  
  <pre><code>richedit1.Lines.Add('Test123');
  </code></pre>
  
  <p>I want <code>Test</code> to be bold but leave <code>123</code> normal.                                                              </p>
  
  <p>Can someone help me?</p>