sed: RE error: illegal byte sequence

[tevfik6]

I'm getting sed: RE error: illegal byte sequence error with the recent changes.

Here are my specs:
Homebrew 1.6.3
Homebrew/homebrew-core (git revision 85d254; last commit 2018-05-08)
git version 2.17.0

It got broken after upgrading the git I guess. I'm not sure what specifically broke it after upgrading brew formulas, I'm getting this error.

I'm not sure it is reproducible or not but my understanding that one of the regular expressions in the bash_completion is not correct. I had no time to dive into. If I find some time, I will let you know my findings

[gecugamo]

I'm also getting this error.

Specs:
macOS 10.13.4 (17E202)
Homebrew 1.6.3
Homebrew/homebrew-core (git revision 27e7; last commit 2018-05-11)
git version 2.17.0

[temrysh]

@tevfik6 && @gecugamo try this:

LC_CTYPE=C && source ~/.bash_profile