print lines matching a pattern

-v, --invert-match
       Invert the sense of matching, to select non-matching lines.  (-v is specified by POSIX.)

    -P, --perl-regexp
           Interpret PATTERN as a Perl regular expression (PCRE, see below).  This is highly experimental and
           grep -P may warn of unimplemented features.

Matching Control
    -e PATTERN, --regexp=PATTERN
           Use PATTERN as the pattern.  This can be used to specify multiple search patterns, or to protect a
           pattern beginning with a hyphen (-).  (-e is specified by POSIX.)