=head2 C<mother_re>
-TODO, see L<http://www.mail-archive.com/perl5-changes@perl.org/msg17328.html>
+TODO, see commit 28d8d7f41a.
=head2 C<extflags>
The number of times the structure is referenced. When
this falls to 0, the regexp is automatically freed
-by a call to pregfree. This should be set to 1 in
+by a call to C<pregfree>. This should be set to 1 in
each engine's L</comp> routine.
=head1 HISTORY