Node Data Type expression to check for multiple values

Summary:

Checking if a value (e.g. testValue = 123) exists in a different hierarchy where the node may have name A_123 or B_123. We currently have a node data type property that searches for A_123, but we need to be able to search for A_123 or B_123. (We want to know if one of them exists; it doesn't matter which one. We are unable to determine if it is "A_" or "B_" from the source node.)

Is there a way to check for two potential values? Or to have a node data type property return an unfound value without causing an error?