replace x^y by pow(x, y)

I found a very useful in-line calculator in
http://vimrc-dissection.blogspot.com/2011/01/vim-inline-calculator-revisited.html

Is it possible to improve it such that it can handle power syntax,
like 2.2^3.4
I know power can be written as pow(x,y) in vim.
But, using ^ to donate power can make the same equation work in
matlab.
And this way is more nature to me.

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