explainshell.com - grep.1posix -vP %27%5E%28%28%5Cs%2B%7C%29%28%5C%2F%5C%2F%7C%23%29%7C%24%29%27

-vP %27%5E%28%28%5Cs%2B%7C%29%28%5C%2F%5C%2F%7C%23%29%7C%24%29%27

search a file for a pattern

-v     Select lines not matching any of the specified patterns.  If  the  -v  option  is  not  specified,
       selected lines shall be those that match any of the specified patterns.

source manpages: grep