Autocmd pattern to match empty file/no filename

Question

Say I want to match a buffer with no filename.

I can use the pattern *, then manually check the filename, like autocmd myVimrc BufEnter * if @% == "" | echom 'blank filename' | endif

Is there a pattern to match just blank filenames?

Answer 1

{} seems to work for just blank filenames.

Example: autocmd myVimrc BufEnter {} echom 'blank filename'. Much cleaner