Ubuntu 26.04 does not allow Regex in sudoers-files, here we trust the script handling all parameters right.

definitions/default/hosts/all/etc/sudoers.d/allow-composition-sync-send

@@ -1,10 +1,2 @@
-# Definition: 3 mandantory parameter, 4. and 5. are optional
+# Script sync-send.sh was designed to reject invalid parameters.
-# [[:space:]]+        -> Expects at least on space character
+composition-sync ALL = (root) NOPASSWD: /cis/script/host/zfs/composition-sync/sync-send.sh
-# ( ... )?            -> defines the group as optional
-Cmnd_Alias C_COMPOSITION_SYNC = \
-    /cis/script/host/zfs/composition-sync/sync-send.sh \
-        ^[a-zA-Z][a-zA-Z0-9_-]* \
-         [a-zA-Z][a-zA-Z0-9.-]* \
-        @[a-zA-Z0-9._:-]* \
-        ([a-zA-Z0-9][a-zA-Z0-9._:-]*)?$
-composition-sync ALL = (root) NOPASSWD: C_COMPOSITION_SYNC