Add flags ala fnr

[lydell]

It would be really cool if you could press <tab> will searching to get a “flags area” to the left of the / in the command line like in FNR. I suggest the following flags:

• z: Toggle fuzzy search.
• r: Toggle regex search (on by default) (this includes implementing a “literal” mode).
• w: Toggle word-boundary matching (off by default) (wraps the search in \< and \>).
• v: Toggle “very magic” mode (off by default) (prepends \v).

Mockup: (zrwv) /search_term.

[junegunn]

Thanks. Good points. But I'm currently not interested in further extending vim-oblique as the code complexity is already unwieldy. I didn't see it coming when I started the project but over the time I realized that reinventing /-search is really not something one can take lightly.