Dollar Escape

Plain math:

$E = mc^2$

Escaped dollars:

@@VYASA_DOLLAR@@5 should render as $5.

this is a $100 phone
this is a @@VYASA_DOLLAR@@100 phone
this is a $100-$200 phone
this is a @@VYASA_DOLLAR@@100-@@VYASA_DOLLAR@@200 phone

@@VYASA_DOLLAR@@ should render as @@VYASA_DOLLAR@@.

\@@VYASA_DOLLAR@@ should render as \@@VYASA_DOLLAR@@.

Inline code should stay literal: \$ and \\$.

Fenced code should stay literal:

$E = mc^2$
\$5
\\$
\\\$