what should i do?  Go to the Training: Regex challenge

/wechall4?(?=\.jpg$|\.png$|\.bmp$|\.gif$|\.tiff$)/

in my test cases my pattern matches all expectable words!

but i cant solv this challenge!!

you know that regular expression is flexible! but it seems like receive kinda static pattern..

and challenge's explanation is ambiguous!

Wouldn't your pattern match xwechall4.jpg too? ;)

And maybe you shouldn't repeat stuff in your pattern since you can write it only once.

/^wechall4?(?=\.jpg|\.png|\.bmp|\.gif|\.tiff$)/

how about this?

Not ok. You still have stuff that you could write only once. And some things shouldn't be enclosed.

thanks a lot!