tags 66680 notabug
thanks

> From: Marco Antoniotti <marcoxa@gmail.com>
> Date: Sun, 22 Oct 2023 14:55:47 +0200
>
> I noted this glitch since 28.x.  Still there in 29.x.
>
> HTML version has the section on 'rx' regexps coding, but it is missing from the PDFs downloadable
> from the main site https://www.gnu.org/software/emacs/manual/emacs.html

This is on purpose: the Rx section is excluded from the printed
manual, to keep the printed manual's size at bay.  Several other
sections are also excluded.

This is not a bug.