Simple filter to strip outer math environment, for use in Typora?

Simple filter to strip outer math environment, for use in Typora?

[Gandalf Saxe]

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Hi,

I'm frequently using Typora <https://typora.io>, which have the problem 
that this will not show up as a live math preview:

\begin{align}
...
\end{align}

, however this will:

$$
> \begin{align}
> ...
> \end{align}
> $$



But since nested math environments are not allowed in LaTeX, one will get 
this error when trying to convert .md to .pdf with pandoc:

! Package amsmath Error: Erroneous nesting of equation structures;
> (amsmath)                trying to recover with `aligned'. 


I've tried `aligned`, and the problem is that it's not equivalent to 
`align` since none of the lines are numbered.
So I could really need a filter to simply strip the outer displaymath 
environment, so that I could write:

$$
> \begin{align}
> ...
> \end{align}
> $$


But filter the AST such that only the align is left.

\begin{align}
> ...
> \end{align}
>

This filter would be very useful to all Typora users who are also using 
pandoc. I suspect this should be pretty easy if you know how. Would 
appreciate any help.

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