How to retrieve part of the Button.Text as a String?

For a Button control below, how can I code UnitButton.Text..... in order to retrieve only Eval("Director") as a String? Text(1)?  Split? Substring????
<asp:Button ID="UnitButton" runat="server" Text='<%# string.Format("{0}-{1}", Eval("Director"), Eval("Unit")) %>' CommandName="Unit" />