php - Can someone please explain this function to me -

i studying how use regexp searching function.then came across this.i have tried days not.i appreciate if can break down me.

<?php  preg_match("#<<(.*)>>#ismu", $object, $options));  ?> 

the stuff between # pattern match against

the ismu @ end modifiers = case insensitive s = matches characters, including newlines. without it, newlines excluded m = treats subject string consisting of single "line" of characters if contains several newlines u = sets regex non greedy default

<<(.*)>> actual pattern self believe pulls out in input text between << >>

so if passed text string this <<strong>>test</strong> code match return array containing strong in strong inside << >> brackets