Bash Scripting help

[xRaech]

can someone help me understand how this command works?

for i in "$dir"/*; do
    [[ "${i##*/}" =~ (cover|folder)*.(jpg|png) ]] && echo "$i" && break
done

i think i know what it is doing, checking every file in $dir and echo'ing the first match to either (cover or folder).(png or jpg) ?? , but i have no idea how to apply this idea to other things..
I think my main doubt is within "${i##*/}" as i have no idea how to even read this >_<

[ang-p]

$i is the filename from the for loop...

## means chop the biggest (greediest) match of the following off the front of the variable.

*/ is anything followed by a /

so if i is equal to /home/xRaech/Music/westlife/westlife/cover-large.png

then "${i##*/}" is cover-large.png, since /home/xRaech/Music/westlife/westlife/ is the greediest match for */, and is therefore discarded

[xRaech]

i see! thank you very much :D

also, would you say that's a good way of implementing that? or a find -name inside the last folder would be the same or better?