Feature: Add a regex filename filter

[o-laurent]

Hi @wkentaro,

I followed the directions that you provided in our discussion.

I remain available for any questions or updates.

This PR depends on #308.

[o-laurent]

Another possibility would be to use something like https://docs.python.org/3/library/fnmatch.html that may be closer to what you expect of the behavior of a ".gitignore".

[wkentaro]

@o-laurent Looking good, thanks. Btw, do you need the command line option?

[o-laurent]

@o-laurent Looking good, thanks. Btw, do you need the command line option?

@wkentaro, I won't need the CLI option. Of course, feel free to remove it if you think that your lib would be better without/it is not necessary.

By the way, I just pulled your changes from #308. This PR also fixes a lint issue.

[wkentaro]

@o-laurent I think #317 is more simple yet flexible. Please check it out.

[o-laurent]

Simpler, I'd say that it depends on the use case, but more flexible, definitely. It will solve my problem nicely. Thanks @wkentaro for your help!