Cannot search for quoted string in content (quotes are ignored)

In FishEye (2.7.14), when I search content for "blah" (including the double quotes), FishEye will give me all matches for blah (with or without double quotes before/after the string). Is there a way to let FishEye give only matches for "blah" literally, so only files which contain the string surrounded by double quotes?

The EyeQL that corresponds to my search is:

select revisions from dir "/" where (is head and content matches "\"blah\"") order by date desc group by changeset return path, revision, author, date, csid

Regardless, I still get all matches of files which do not have the quotes ...

(See also short discussion on Atlassian Answers here)