what is the variable name that will capture only the latest document name?

if i use {principleBusinessObject} it will give me the document name, the windchill number 1000066578, and the document name with the revision number.  my output would be

TestDocumentWindchill,0000017893, TestDocumentWindchill, A.3

I want a variable to only give me the name in red or in green would be fine.