+See also: L<perlsub/Constant Functions>
+
+=item use re 'strict';
+
+Introduced in Perl 5.22.0
+
+Using this feature triggers warnings in the category
+C<experimental::re_strict>.
+
+See L<re/'strict' mode>
+
+=item String- and number-specific bitwise operators
+
+Introduced in Perl 5.22.0
+
+See also: L<perlop/Bitwise String Operators>
+
+Using this feature triggers warnings in the category
+C<experimental::bitwise>.
+
+The ticket for this feature is
+L<[perl #123707]|https://rt.perl.org/rt3/Ticket/Display.html?id=123707>.