$format_search    = array(
            '#\[url=(.*?)\](.*?)\[/url\] by \[url=(.*?)\](.*?)\[/url\], on Flickr#i',
            "@\[b:([a-zA-Z0-9]+)]@i", 
            "@\[quote:([a-zA-Z0-9]+)=@i", 
            "@\[/quote:([a-zA-Z0-9]+)\]@i",