How to select adjacent characters?

So in one of my ebooks I have a recurring combo of (-?) in between words/sentences/etc. I want to change all of them to just a dash. How would I go about selecting both the "-" and "?" but not individual "-"s and "?"s in the search and replace function? I've tried several methods but they all seem to select every individual dash and question mark.

Sorry I'm quite new to editing and this forum! If there is already a thread involving this situation I'd love to be pointed in that direction.

Thanks!

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