Using :let to view a wildcard of variables

Vim 7.3.315

My plugins all use naming conventions for variables.

:let

Will display all variables currently defined in Vim.

One thing I have always wanted to do is:
:let my_prefix.*

Or something like that to show all variables beginning with my_prefix.

The only way I have come up with a way to do this is:
:new
:redir @a
:let
:redir end
"ap
:v/^my_prefix/d

Which essentially does want I want, but is a real pushup.

Can any Vimmers suggest a more streamlined approach?

Thanks,
Dave

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