[O] How to replace \( by $$ and such when exporting to markdown

[Rafael]

Hi all,

I'm trying to publish some beamer presentations with mathematical
content as pages in octopress. I think I'm on my way to get a working
setup, but I would like some help to achieve the following:

With an up-to-date org (from git), define some functions that, when
exporting to markdown with ox-md, automatically replace all instances of
\(, \), \[ and \] with $$.

Thanks in advance for any help.

Rafael