Use contents of register in search?

This is probably one of those "You use vim and don't know how to do
that?!?!" things, but I'd like to be able use the contents of a register
in a search. I often have some text and want to find out where else that
text occurs. I can get the text into a register, but then would like to
search for that text. :help /, :help pattern, and usr_27.txt don't
contain "register" at all, and :help search does, but that's all about
manipulating registers in vimscript, so I don't know how/if that applies.

Thanks much,
Brian

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