Update to regex 0.2.1

[kubo39]

No description provided.

[viseztrance]

This looks good, thank you.

The is_empty change was a nice catch. The code you modified prints search options arguments such as "Filter [M]ode" into "Filter Mode" (notice the emphasised M, underlined in the readme gif). I placed it there to handle string arguments having no [..] captures, which was nothing short of premature.