The substitution failed in cases where the diff is only 6,12,18,... bytes. It failed in 16 from 106 Edits
in all ather cases it worked as expected. the same sustitution works on other pages. But when I try do subst this on pages where it failed before, it will also fail after change of wikitext.
https://de.wikipedia.org/w/index.php?title=Bischofswerda&action=history
is it possible that there is a none visuable nowiki-tag from visual editor?