Italian java.util.regex.PatternSyntaxException: Incorrectly nested parentheses in regexp pattern near index

Sub p  solved
    Dim Valore As String = "DA203(DA302|>|0|)"
    Dim campi() As String
    campi=Regex.Split("[(]",Valore)
    For j=0 To campi.Length
        Log(campi(j) )
    Next
End Sub

campi=Regex.Split("\(",Valore)