nnheader-numerical-short-files

nnheader-numerical-short-files is a variable defined in `nnheader.el'.
Its value is

"^\\([0-9]+\\)\\(\\.Z\\'\\|\\.bz2\\'\\|\\.tbz2?\\'\\|\\.\\(?:tgz\\|svgz\\|sifz\\)\\'\\|\\.g?z\\'\\|\\.lz\\'\\|\\.lzma\\'\\|\\.xz\\'\\|\\.txz\\'\\|\\.dz\\'\\)?"

Documentation:
Regexp that matches numerical file names.