有人可以向我解释这个功能[关闭]

Question

I am currently studying how to use the regexp searching function.Then i came across this.i have tried for days to get but i could not.i will appreciate if someone can break it down for me.

<?php

preg_match("#<<(.*)>>#ismU", $object, $options));

?>

Answer 1

the stuff between the # is the pattern to match against

the ismU at the end is the modifiers so i = case insensitive s = matches all characters, including newlines. Without it, newlines are excluded m = treats the subject string as consisting of a single "line" of characters even if it actually contains several newlines U = sets the regex to be non greedy by default

<<(.*)>> is the actual pattern its self which I believe pulls out everything in the input text between << >>

So if you passed a text string this is some <<strong>>test</strong> code to the match it would return an array containing strong in it as strong is inside the << >> brackets