What it would be if String.Split() did not accept muptiple delimiters

gistfile1.cs

        [Fact]
        public void selectManyTest()
        {
            var s = "2#3,4%5";
            var delimiters = "#,%";
            var e = delimiters
                .Aggregate(Enumerable.Repeat(s, 1), (current, delimiter) => 
                    current.SelectMany(s1 => s1.Split(delimiter)));

            e.Should().Equal(new[] {"2", "3", "4", "5"});
        }