You know, I think I better add to this post:
I also did some extensive searches today on a huge log file and used the Regular Expression mechanism.
I was about to construct my search criteria and clicked on Zero or One ( the ? mark) using the GUI (Ctrl-F, right arrow on the right off the Find What text box and chose it from the small pop-up window).
At this point the ? sign was not inserted into the Find What text box, but others seem like do (did not try every single one).
I also have spotted that: sometimes the search symbols get appended and sometimes just get in-between.
I think both things are bugs.
PS: Play around there by highlighting the search pattern, etc.
Sorry if my explanations are incomplete, need to run,
thanks