How do I query for ANY alphanumeric contents in a custom metadata field?

[pete31]

[I’m posting here to don’t mix up the threads]

@Ryan_N

I want to first examine all the files in my database in which I actually entered something in a those (single-line text custom metadata) fields I’m planning to delete for good.

Over here this query

mdbookends!=

results in all records whose meta data “Bookends” is not empty.