I am trying to find a shortcut to place a custom comment sequence on my code, e.g.:

/*
start of comment
blah
end of comment
/**/

(it is easier to void the comment by just adding a / to the beginning)

I would like to do this in Vim by selecting a visual line, block or char and adding '/' characters at the beginning of the block and '/*/' at the end, plus newlines.

After selecting some lines (Shift-V) I tried this:

'<,'>s/\(.*\)/\/*\r\1\r\/**\//

But it adds the comment chars at EACH newline.

How can I only apply the substitution at the beginning and end of the selected range?

Thanks gm