e=
for i in 0 1 2 3; do
	for j in 0 1 2 3 4 5 6 7; do
		for k in 0 1 2 3 4 5 6 7; do
			case $i$j$k in
			000) continue ;;
			esac
			e="$e\\$i$j$k"
		done
	done
done
e=$(printf "$e")
v=@$e@$e@
y=${v##*"$e"}
yq="${v##*"$e"}"
[ "$y" = @ ] || echo "error when unquoted in non-splitting context"
[ "$yq" = @ ] || echo "error when quoted in non-splitting context"
[ "${v##*"$e"}" = @ ] || echo "error when quoted in splitting context"
IFS=
[ ${v##*"$e"} = @ ] || echo "error when unquoted in splitting context"