Vandami, Bhante _/\_
It seems I have found a quick fix: https://forum.dokuwiki.org/post/63653
Changed file "inc/pageutils.php" at line 232 from
$title = str_replace(array(':','.'),'',cleanID($title));
to:
$title = str_replace(array(':'),'',cleanID($title));
Not sure if this will cause any other problems. Maybe there is a good reason why DokuWiki would remove all dots from anchor links and section ids. It should not cause any big problems (like data loss) but changes only how the page is rendered. So if something is wrong with this approach and something strange appears, one can simply change it back and look for a better way.
It might be that the change only comes into effect for each page after editing it one more time (to rebuild the page in the cache, but I'm not sure how this process works in detail and maybe it happens automatically after some time. For the test page http://accesstoinsight.eu/playground/playground/anchor#mv0102 it worked after just making a small change in the file and saving again).
_/\_
/me going now off to other work. Wishing a good day _/\_
Changed file "inc/pageutils.php" at line 232 from
$title = str_replace(array(':','.'),'',cleanID($title));
to:
$title = str_replace(array(':'),'',cleanID($title));
Now changed it further to just:
$title = cleanID($title);
to allow also for colons.
Seeing no technical reason why periods or colons should not be allowed in section ids (and anchor links), I had opened an issue on the DokuWiki GitHub page (https://github.com/splitbrain/dokuwiki/issues/2580) before, discussing it in detail and suggesting that it be changed in official DokuWiki. So far, not addressed there.
https://github.com/splitbrain/dokuwiki/issues/2580