Keystroke command

Hi all,

My question is a little hard to explain.
I know how to use :map to imitate keystrokes.
But I don't want to use :map every time.
Is there anyway to use : command to imitate keystrokes without :map?
For example gUw is the keystrokes to change the current word to uppercase.
Can I put gUw into the command like...

:%s/^foobar/gUw/g
to change any foobar at the beginning of the line to FOOBAR?
(I know this is a wrong example, I'm trying my hard time to explain. ;-p )

Thank you,

--
Gua Chung Lim

To live is to love.

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