[PATCH] sed: Add support for POSIX -E to select EREs (this is a synonym for -r)

[David A. Wheeler]

I asked:
> >> Is there a reason the documentation for "-E" was dropped?

Denys Vlasenko:
> > GNU sed doesn't document it either.

walter harms:
> I would see that as a bug in GNU sed. There is no reason to repeat that.

I agree, the busybox docs should describe the busybox options.

In any case, GNU sed just fixed that bug; they accepted this
patch which documented "-E":
  http://git.savannah.gnu.org/cgit/sed.git/commit/?id=8b65e07904384b529a464c89f3739d2e7e4d5135

--- David A. Wheeler