[DNSB]

Not sure if this is what you need but seems to work for me. I set the What kind of match to use field to Regular Expression and entered ' berry$' (removing the single quotes) in the author search field. The $ should match any author with berry at the end of the author field while the space at the start of the search keeps from matching authors whose name ends with berry. The search string generated looks like this: author:"~ berry$"