I did:
root@sirwiz: ~;(RC=0) # zypper install --force --allow-downgrade --replacefiles /var/cache/zypp/packages/tw.Ioss/x86_64/libpcre2-16-0-10.36-2.12.x86_64.rpm /var/cache/zypp/packages/tw.Ioss/x86_64/libpcre2-8-0-10.36-2.12.x86_64.rpm
Processing…
Retrieving repository 'tw.LEB' metadata ..........................................................................................................................................................................................[done]
Building repository 'tw.LEB' cache ...............................................................................................................................................................................................[done]
Loading repository data...
Reading installed packages...
Forcing installation of 'libpcre2-16-0-10.36-2.12.x86_64' from repository '_tmpRPMcache_'.
Forcing installation of 'libpcre2-8-0-10.36-2.12.x86_64' from repository '_tmpRPMcache_'.
Resolving package dependencies...
The following 2 packages are going to be downgraded:
libpcre2-16-0 libpcre2-8-0
2 packages to downgrade.
Overall download size: 693,3 KiB. Already cached: 0 B. After the operation, 3,1 KiB will be freed.
Continue? [y/n/v/...? shows all options] (y): y
Retrieving package libpcre2-8-0-10.36-2.12.x86_64 (1/2), 376,6 KiB (857,4 KiB unpacked)
Retrieving package libpcre2-16-0-10.36-2.12.x86_64 (2/2), 316,6 KiB (677,8 KiB unpacked)
Checking for file conflicts: .....................................................................................................................................................................................................[done]
(1/2) Installing: libpcre2-8-0-10.36-2.12.x86_64 .................................................................................................................................................................................[done]
(2/2) Installing: libpcre2-16-0-10.36-2.12.x86_64 ................................................................................................................................................................................[done]
There are running programs which still use files and libraries deleted or updated by recent upgrades. They should be restarted to benefit from the latest updates. Run 'zypper ps -s' to list these programs.
root@sirwiz: ~;(RC=0) # systemctl restart php-fpm httpd
and got my syntax page back to a working state. Only the configuration manager page still shows square brackets instead of links:
Dieses Plugin hilft Ihnen bei der Konfiguration von DokuWiki. Hilfe zu den einzelnen Einstellungen finden Sie unter [[doku>config]]. Mehr Information zu diesem Plugin ist unter [[doku>plugin:config]] erhältlich.
Now I need to have a look at the "old" configuration manager pages and to test my "old" single line syntax.