class Thor::Actions::InjectIntoFile

def revoke!
  say_status :revoke
  regexp = if @behavior == :after
             content = '\1\2'
             /(#{flag})(.*)(#{Regexp.escape(replacement)})/m
           else
             content = '\2\3'
             /(#{Regexp.escape(replacement)})(.*)(#{flag})/m
           end
  replace!(regexp, content, true)
end