is there any way to vimgrep, limiting to >1 but not all types of files?

i'm pretty used to doing either:

:vimgrep /whatever/ **/*

or

:vimgrep /whatever/ **/*.txt

but is there a way with vim globbing to do, say, 2 file types? i guess i want something that would work kind of like this:

:vimgrep /whatever/ \*\*/.(txt|vb)

:vimgrep /whatever/ *.{txt,vb}

Is what you're looking for, I believe.