XPath Expression to Check if certain condition

Hi Experts,

    I need to control some kind of messages need to ignore at SAP PI side. So, I am trying to ignore by config at Receiver configuration at ICO.

Here I need to ignore transaction types like - T*, W* ( starts with T /Starts with W).

In this case, what type of operator can we use ? How to ignore messages which start with something ?

Deva