Mine

			/*-------------------------------------------------------------------------*/
			// If we are not parsing a siggie, lets have a bash
			// at the [PHP] [SQL] and [HTML] tags.
			/*-------------------------------------------------------------------------*/
			
			$txt = preg_replace( "#\[sql\](.+?)\[/sql\]#ies"    , "\$this->regex_sql_tag('\\1')"    , $txt );
			$txt = preg_replace( "#\[html\](.+?)\[/html\]#ies"  , "\$this->regex_html_tag('\\1')"   , $txt );
			
			//-----------------------------------------
			// left, right, center
			//-----------------------------------------
			
			$txt = preg_replace( "#\[(left|right|center)\](.+?)\[/\\1\]#is"  , "<div align=\"\\1\">\\2</div>", $txt );
			
			//-----------------------------------------
			// Indent => Block quote
			//-----------------------------------------
			
			while( preg_match( "#\[indent\](.+?)\[/indent\]#is" , $txt ) )
			{
				$txt = preg_replace( "#\[indent\](.+?)\[/indent\]#is"  , "<blockquote>\\1</blockquote>", $txt );
			}