This shows you the best way to split strings in Dynamo VB.Net
Imports System.Text.RegularExpressions
Module Module1
Sub Main()
' The input string.
Dim sentence As String = "10 cats, 20 dogs, 40 fish and 1 programmer."
' Invoke the Regex.Split shared function.
Dim digits() As String = Regex.Split(sentence, ", ")
' Loop over the elements in the resulting array.
For Each item As String In digits
Console.WriteLine(item)
Next
End Sub
End Module
'http://www.dotnetperls.com/regex-split-vbnet