Searching Annotations from: Moby Dick.
(* Select both the attributes you wish to search on and the attributes you want to see displayed in the results. The names that start with "Icon" are visible properties that all annotations possess. The names that start with an underscore are optional attributes that may or may not be present in each annotation type. Some optional attributes affect a visible property and some do not. If you don't care which optional attribute set the IconMouseoverText to a particular value, search for it via its Icon name, otherwise search for the specific attribute that you're interested in.)
(** Use % as a wildcard—for example, "%red%" would match the word "red" at any point in the text. Using a single "%" will match any present value, which means that annotations that don't include that attribute are excluded. Leaving the find text empty will not place any restrictions on that attribute, but simply return it amongst the results.)