Any clue on level 4?  Go to the Training: Regex challenge

hey guys, can anyone tell me why i failed on Regex level 4 ?
I tried my expression /^[^\.]*/ , it worked on test tool, but failed on this site.

"... could you please capture the filename, without extension, too?"

So you have to still do what was needed for level 3, but now also capture (not just match) a part of the filename. Your expression doesn't do either.

(Also, that backslash is not needed.)

Thank you, dloser, for sharing keyword capture etc. As the top player, you probably have lots of important things to do everyday I guess.
Appreciate your generously guidance !