p4raw-id: //depot/perl@13009
The Perl parser will expand $variable and @variable references in
regular expressions unless the delimiter is a single quote. Remember,
-too, that the right-hand side of an C<s///> substitution is considered
+too, that the right-hand side of a C<s///> substitution is considered
a double-quoted string (see L<perlop> for more details). Remember
also that any regex special characters will be acted on unless you
precede the substitution with \Q. Here's an example: