Web - Server

Hi all!
anyone can give me a hint for this challenge
i understand preg_replace function in php
how to take flag.php file...show similar example if you can
thanks for help

You should have a look on the internet to learn a bit about preg_replace() security flaw. Don’t you think ?
Have fun.

for "preg_replace() security flaw"
thanks bro

can someone tell me.. how to use this. I don’t know much about this