c_CTRL-R* *c_<C-R>*


'"' the unnamed register, containing the text of
the last delete or yank
'%' the current file name
'#' the alternate file name
'*' the clipboard contents (X11: primary selection)
'+' the clipboard contents
'/' the last search pattern
':' the last command-line
'-' the last small (less than a line) delete
'.' the last inserted text
'=' the expression register: you are prompted to

enter an expression (see |expression|)
See |registers| about registers. {not in Vi}