//^(.*?(\d{4})/(\d{2})/(\d{2}).*)$ $1

1 //$

1 0?(\d+)/0?(\d+)$ $1/$2( 2 $ (\d) )$1 2 (\d\d:\d\d):\d\d(\.\d\d)? $1 2 0?(\d:\d\d) $1 2