{ perldoc perlre ; perldoc perlop ; } | grep -C 2 unaffected
       just as in ordinary Perl code.  This also means that if you want real
       whitespace or "#" characters in the pattern (outside a character class,
       where they are unaffected by "/x"), that you'll either have to escape
       them or encode them using octal or hex escapes.  Taken together, these
       features go a long way towards making Perl's regular expressions more
--
               cards, pipes, and redirections will be honored.  The collected
               standard output of the command is returned; standard error is
               unaffected.  In scalar context, it comes back as a single
               (potentially multi-line) string, or undef if the command
               failed.  In list context, returns a list of lines (however