the / and ? commands in the pagers more and most less implementations should support regular expressions (usually BREs in my experience); which is the same thing grep uses. Consider reading your friendly neighborhood regex formatting manpage, if you are confused. As for easily scrolling, ^G to terminate your search followed by b (or your favorite vi or emacs scrolling bind) to scroll back should be sufficient.
Also, man some-manpage | grep expression works, if you didn’t know.