Edit: As others pointed already out: String.Split has a good overload for your usecase. The answer below is still correct (as in working), but - not the way to go.

That's because this string.Split overload takes an array of separator chars. Each of them splits the string.

You want: Regex.Split

Regex regex = new Regex("<^>");
string[] substrings = regex.Split("TestString 1 <^> TestString 2 <^>  Test String3");

And - a sidenote:

"<^>".ToCharArray()

is really just a fancy way to say

new[]{'<', '^', '>'}

Edit: As others pointed already out: String.Split has a good overload for your usecase. The answer below is still correct (as in working), but - not the way to go.

That's because this string.Split overload takes an array of separator chars. Each of them splits the string.

You want: Regex.Split

Regex regex = new Regex(@"<\^>");
string[] substrings = regex.Split("TestString 1 <^> TestString 2 <^>  Test String3");

And - a sidenote:

"<^>".ToCharArray()

is really just a fancy way to say

new[]{'<', '^', '>'}