General :: How To Tar Files With No Extensions

I have some directories with a varying numbers of files and subdirectories. All files that have no extensions have to be tared. Their names may change, thus they can not be hardcoded. Subdirectories may also contain a unspecified number of files and subdirectories that are not relevant and should not be included in the archive.

I'd like to be able to do this with a single line, not using any .sh scripts, so that this process could be reproduced as portably as possible.

Sample directory structure:

$ ls -1F
bar-dir/
bar.with.dots
foo-directory/
foo-no-ext

[Code].....