php正则问题

Question

$dsnStr='mysql://root:root@127.0.0.1:3306/test';
preg_match('/^(.?)://(.?):(.?)@(.?):([0-9]{1, 6})/(.*?)$/',trim($dsnStr),$matches);
想请教一下这个为啥匹配不出来,$natches是空数组，该怎么改才能匹配出来啊

Answer 1

preg_match('/^(.*?):\/\/(.*?):(.*?)@(.*?):([0-9]{1,6})(.*?)$/',trim($dsnStr),$matches);

Answer 2