expression - How do I remove all non-ASCII characters with regex and Notepad++?

I searched a lot, but nowhere is it written how to remove
non-ASCII characters from Notepad++.

I need to
know what command to write in find and replace (with picture it would be
great).

• If
  I want to make a white-list and bookmark all the ASCII words/lines so non-ASCII lines
  would be unmarked




• If the file is quite
  large and can't select all the ASCII lines and just want to select the lines containing
  non-ASCII characters...