It seems the "prefix:" search operator doesn't deal well with spaces: it uses the correct prefix for the search, but also searches for the words of the prefix in the text of the pages, which yields undesired results.
I tried using underscores (prefix:the_prefix) and quotation marks (prefix:"the prefix"), but both returned no results. Maybe the underscore trick could be used as a workaround. That would also allow using the operator anywhere on the search, not only on the ending. Another option could be enclosing it in parens, i.e. "some search terms (prefix:a page name) more search terms"
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