$donen = preg_replace('|\[color=([a-z0-9#]*?)\](.*?)\[/color\]|si','<font color="\\1">\\2</font>',$donen);

$donen = preg_replace('|\[gmp3\]([a-z0-9?&\\/\-_.:,=#@]+?)\[/gmp3\]|si','<div style="width:465px;"><embed src="http://www.google.com/reader/ui/3247397568-audio-player.swf?audioUrl=$1" type="application/x-shockwave-flash" quality="high" WIDTH="445" HEIGHT="27" wmode="transparent"></embed></div>',$donen);