preg replace issue

i have a quote set up i made that replaces the blockquote of html that's been deprecated. issue is that the preg replacement doesn't work on nested quotes. not quite sure why. if anyone can tell me why and help me fix it, i would appreciate that.current php preg search:[php # add quotes
$postcode=preg_replace('|\

|i', '', $postcode);
$postcode=preg_replace('|\[quote(=(.*))(?U)]|i', 'Quote \2', $postcode);[/php]result can bee seen in this thread:http://www.findyourdesire.com/forums.php?fid=4&tid=13 (currently the last post has got a nested one)

thanx in advance for the help.
josh

figured it out