split string by string (not single char)

Hi,

I need to split strings in vb net by strings of 2 to x chars but I cannot get it working. On the net I found this:
Dim strMyString As String = "test|:text" Dim sarrMyString As String() = strMyString.Split(New String() {"|:"}, StringSplitOptions.None) |: in my case would be for example pzsplit
but when I try to split, my strings still get split after the first char of the string to split (say 'p').

Anyone got an idea how to solve this?
Thanks,
Pascal