Usage of php regular preg_replace_callback function

// Define a dummy text, for testing...
$Text = "Title: Hello world!\n";
$Text .= "Author: Jonas\n";
$Text .= "This is a example message!\n\n";
$Text .= "Title: Entry 2\n";
$Text .= "Author: Sonja\n";
$Text .= "Hello world, what's up!\n";
// This function will replace specific matches
// into a new form
function RewriteText($Match){
  // Entire matched section: 
  // --> /.../
  $EntireSection = $Match[0];
  // --> "\nTitle: Hello world!"
  // Key 
  // --> ([a-z0-9]+)
  $Key      = $Match[1];
  // --> "Title"
  // Value 
  // --> ([^\n\r]+)
  $Value    = $Match[2];
  // --> "Hello world!"
  // Add some bold (<b>) tags to around the key to
  return &#39;<b>&#39; . $Key . &#39;</b>: &#39; . $Value;
}
// The regular expression will extract and pass all "key: value" pairs to
// the "RewriteText" function that is definied above
$NewText = preg_replace_callback(&#39;/[\r\n]([a-z0-9]+): ([^\n\r]+)/i&#39;, "RewriteText", $Text);
// Print the new modified text
print $NewText;