Search function cannot detect special characters

I am simply trying to find and replace some text strings in my PDF that contain colons and periods. However, the search function doesn't seem to work when I include these characters -- it finds 0 instances. It also cannot detect @ signs or slashes. If I use Advanced Search, it finds them just fine, but there's no option for find and replace in advanced search. This seems like a very basic function so I'm a little confused here, am I missing something? 

Thanks for your help!