Searching specific levels in OmniOutliner

Is there any way to search specific levels in OmniOutliner? The way my notes are structured, there are times I wish I could search only a certain level but no lower. I realize I could use a row filter: collapse all levels, specify a row filter, then only visually open and scan down to the level I want. But that’s clunky, and would export more than desired. It would be nice if row filters would expose some of the outline metadata for searching, like the level of the row. Then I could use the standard numerics of “less than”, “greater than” etc. I’ll contact support about an enhancement request, but thought I would first check to see if anyone has a way.
And, I’m still carrying the torch for regular expression searching in row filters. Put in those requests so we can get it! :)