Why does he use the ? sign in the grep command regular expression? Is it not enough to just use the ".*" like grep -oE "picoCTF{.*}". It drives me mad that I do not get it.
If the output contains another closing bracket, greedy capture would get the entirety of it. Not necessary here, but it's a good habit to have when dealing with regex matching something in brackets.
if the text content for example included picoCTF{aaaaa}aaaaa and then another }, the grep without the question mark would output "picoCTF{aaaaa}aaaaa and then another }"
Lmao, i have been tinkering the program only not to notice that the category was not a reverse engineering problem but a binary exploitation problem. stupid me. LOL
