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[Mark]

Code:

function bbcode($string)
 {
  $string = preg_replace("#\[b\](.+?)\[/b\]#is", "<b>\\1</b>", $string);
  $string = preg_replace("#\[i\](.+?)\[/i\]#is", "<i>\\1</i>", $string);
  $string = preg_replace("#\[u\](.+?)\[/u\]#is", "<u>\\1</u>", $string);
  $string = preg_replace("#\[link\]www\.(.+?)\[/link\]#is", "<a href=\"http://www.\\1\">www.\\1</a>", $string);
  $string = preg_replace("#\[link\](.+?)\[/link\]#is", "<a href=\"\\1\">\\1</a>", $string);
  $string = preg_replace("#\[link=(.+?)\](.+?)\[/link\]#is", "<a href=\"\\1\">\\2</a>", $string);
  $string = preg_replace("#\[url\]www\.(.+?)\[/url\]#is", "<a href=\"http://www.\\1\">www.\\1</a>", $string);
  $string = preg_replace("#\[url\](.+?)\[/url\]#is", "<a href=\"\\1\">\\1</a>", $string);
  $string = preg_replace("#\[url=(.+?)\](.+?)\[/url\]#is", "<a href=\"\\1\">\\2</a>", $string);
  $string = preg_replace("#\[img\](.+?)\[/img\]#is", "<img src=\"\\1\" alt=\"[image]\" style=\"margin: 5px 0px 5px 0px\" />", $string);
  $string = preg_replace("#\[img-l\](.+?)\[/img\]#is", "<img src=\"\\1\" alt=\"[image]\" style=\"border: thin solid #DFE5F2; FLOAT: left; MARGIN-RIGHT: 20px\" />", $string);
  $string = preg_replace("#\[img-r\](.+?)\[/img\]#is", "<img src=\"\\1\" alt=\"[image]\" style=\"border: thin solid #DFE5F2; FLOAT: right; MARGIN-LEFT: 20px;\" />", $string);

  return $string;
 }

$e = &$modx->Event;
switch ($e->name) {
case "OnWebPagePrerender":
$o = &$modx->documentOutput; // get a reference of the output
$o = bbcode($o);
 break;
default :
return; // stop here - this is very important.
 break;
}

Code is based on the Plugin Example Word Filter + Orca Scripts Blog. P.S. You can use the bbcode($string) function to parse bb code in your NewsPublisher snippet if your users cannot use a RTE (Mainly Mac Users).