PHP编程：php正则preg_replace_callback函数用法实例

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