insert-register

insert-register is an interactive compiled Lisp function in `register.el'.

It is bound to C-x r g, C-x r i.

(insert-register REGISTER &optional ARG)

Insert contents of register REGISTER. (REGISTER is a character.)
Normally puts point before and mark after the inserted text.
If optional second arg is non-nil, puts mark before and point after.
Interactively, second arg is nil if prefix arg is supplied and t
otherwise.

Interactively, reads the register using `register-read-with-preview'.