(I missed OP's reply which stated the same as below.)

I could not find that line in my copies of perlre or perlop (perl 5.8.7) ... 

{ perldoc perlre ; perldoc perlop ; } | grep -C 2 unaffected
       just as in ordinary Perl code.  This also means that if you wan
+t real
       whitespace or "#" characters in the pattern (outside a characte
+r 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 expression
+s more
--
               cards, pipes, and redirections will be honored.  The co
+llected
               standard output of the command is returned; standard er
+ror is
               unaffected.  In scalar context, it comes back as a sing
+le
               (potentially multi-line) string, or undef if the comman
+d
               failed.  In list context, returns a list of lines (howe
+ver

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In reply to Re^2: /x modifier with \Q and \E by parv
in thread /x modifier with \Q and \E by wardy3

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