Hey John
The attached mwe.tex fails even with https://github.com/jgm/pandoc/releases/download/2.1.3/pandoc-2.1.3-1-amd64.deb
$ pandoc mwe.tex  


Error at "source" (line 1, column 54):

unexpected Tok "source" (line 1, column 54) Symbol "_"

expecting end of input

donde~$\rho$ es la densidad del acero, $\rho_\text{D$_2$O}=\SI{866}{\kilogram\per\cubic\meter}$ la densidad del agua pesada a~$\SI{250}{
\celsius}$, y $r_i$ y $r_o$ los radios internos y externos respectivamente.

                                                     ^


regards--jeremy thelerwww.seamplex.com
On Fri, 2018-04-20 at 08:09 -0700, John MacFarlane wrote:
> What version of pandoc are you using?It works fine for me with the latest.
> Jeremy Theler <jeremy-24em0bpozeFWk0Htik3J/w@public.gmane.org> writes:
> Hi all. Pandoc is complaining about an unexpected underscore (the one after D$) when parsing a complex (yet still valid) LaTeX inline math expression:
> 
> The density of heavy water is $\rho_\text{D$_2$O}$
> 
> 
> 
> 
> I understand the parsing logic is complex because there are nested levels. Can a similar logic be implemented in Pandoc to handle this expression?
> 
> 
> regards--jeremy
> 
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