public FEELFnResult<Object> invoke(@ParameterName("input") String input, @ParameterName("pattern") String pattern,
                                       @ParameterName( "replacement" ) String replacement ) {
        return invoke(input, pattern, replacement, null);
    }
@Test
    void invokeWithFlagMultiline() {
        FunctionTestUtil.assertResult(replaceFunction.invoke("foo\nbar", "^b", "ttt", "m"), "foo\ntttar");
    }