Search and replace via sed with line break?

Question

linux

We have

cat test
one
two
three
four

I do this and
sed s/two\nthree// test
sed s/two.*three// test
in both cases I get:

one
two
three
four

How to get the?

one
four

Answer 1

sed -rz 's/two\nthree\n//' test