I have been trying to perform a discovery and add only specific interfaces on my routers/switches. I have found through testing that the discovery IS case sensitive so you need to add every iteration of the way a term may be spelled.
The problem I'm running into is if I add a single entity such as 'sw' the discovery works fine, but if I have several it fails completely. I am trying to add 32 unique terms to look for in the interface alias.
Don't know exactly where it breaks but in this example rtr - the 15th item never gets discovered. If I put it at the very top it works.

The Help docs don't reference a maximum number possible.
http://www.solarwinds.com/documentation/en/flarehelp/orionplatform/content/core-automatically-add-discovered-nodes.htm?cshid=OrionCoreSonarDiscMonitorAutoImport