Grep to remove non-ASCII characters

Shell Programming and Scripting
1

I have been having an encoding problem that I need to solve.
I have an 4-column tab-separated file: I need to remove all of the lines that contain the string 'vis-�-vis'

achiever-n    vis-�-vis+ns-j+vp    oppose-v    1
achiever-n    vis-�-vis+ns-the+vg    assess-v    1
administrator-n    vis-�-vis+n-the+n    position-n    1
adobe-n    vis-�-vis+n-a-j+n-a-j    ad-n    1

In this way, if my file contains 4 lines that contain 'vis-�-vis' they will all be filterd.
How can I do this with a one liner grep?

---------- Post updated at 01:18 PM ---------- Previous update was at 01:09 PM ----------

or I need something that removes all non-ascii characters..

or that does the opposite of this grep

grep --color='auto' -P -n '[^\x00-\x7F]' file

I have tried

grep --color='auto' -P -n '![^\x00-\x7F]' file

with no success

2

Try:

grep --color='auto' -P -v -n '[^\x00-\x7F]' file
3

I have tried that option too -- and it doesn't seem to remove anything... just reprints out the entire input file...

4 
egrep -v "[ -~]" file
5

Thank you for the responses - they both just seem to work just fine.