Have you looked at the various CPAN modules? There are at least Markdown::Pod, Pod::Markdown, Markdown::To::POD, Pod::Markdown::Github.

What problems do you perceive with them that you want to write your own?

In reply to Re: POD <-> Markdown notation by Corion
in thread POD <-> Markdown notation by stevieb

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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