php - BBCode parse quotes

Okay, I'm currently trying to create bbcodes for my home made forum. It worked good, until I started with quotes. This is my function:

public function forum_parse ($string)
{
  global $core, $path;
  $string = $this -> normal_parse ($string);

  $search = '/\[quote=([A-z0-9 -_\'"]+);([0-9]+)\](.*)\[\/quote\]/is';
  $replace = '<div ><p ><a href="' . $path . 'forum/viewtopic?p=$2">' . WRITTEN_BY . ' $1</a></p><p >$3</p></div>';

  return preg_replace ($search, $replace, $string);
}
Copy code

It works good when there's one quote per post, but when there's more, the problems begin. It obviously doesn't start from the root quote and choose accurate end tags by itself. And I' not experienced with RegEx enough to fix it. Any help? :/