大侠，帮小弟看看，这个正则错在哪里

$str = "<span id='keitai-inc' >99.99 </span> ";

$patt = "#<span\s+id='(.*)'\s*>(\d{2}[.]\d{2})\s*</span>\s*#";

preg_match($patt,$str,$m);

print_r($m);