In Calc, the "Find & Replace" dialog has a "Wildcard" checkbox, which is, naturally, mutually exclusive to "Regular expressions". They do similar functions, and should at least be placed near each other, if not grouped.
@Jim, I thought you could be interested in this issue.
Wildcard, Regular expressions, and Similarity search options are mutually exclusive or none select. Wildcard and Comments options share the same layout box. Wildcard is hidden in Writer and shown in Calc and vice-a-versa. For Impress and Draw the Wildcard/Comments layout box is hidden. Attached are screenshots of a proposed placement of the Wildcard/Comment option in the Find & Replace dialog for Calc and Writer. The Wildcard/Comments option is moved above Regular expressions option and the Sounds like (Japanese) option is moved to the previous location of Wildcard/Comments.
I used Glade to edit the Find & Replace dialog file to create the attached screen shots.
Created attachment 144101 [details]
Proposed Wildcards placement in Calc Find & Replace dialog
Created attachment 144102 [details]
Proposed Comments placement in Writer Find & Replace dialog