symfony and mathjax compatibility - symfony

Question

after many search on google, it seems that my problem is not very well documented.
I am developping a symfony blog which contains maths. So I have tried to use mathjax. It works well but the problem is that the character '&' and '\\' are not send as it is in the web page (when I look in the source code of the firefox, the character are : '& amp;' and '& #92;').
The content is stored in the database and the characters in the database are correct.
Is there clean way to solve the problem ? Maybe by Mathjax side or Symfony side ?
I have tried to use raw twig filter but the character are still the same in the source code.
Thank you very much :)
EDIT:
I use knplabs/knp-markdown-bundle with the default filter to print the post content : post.content|markdown, and when I retire the |markdown the characters are correct but I have not the markdown conversion...
EDIT 2: Ok after a morning of search, I found what is my problem. Me, I parse the markdown into back end (php) and then javascript parse the html (markdown -> mathjax). But usually, all is done with javascript in this sense : mathjax -> markdown. like in this app : https://github.com/kerzol/markdown-mathjax.
So my new question is, is there a way to make mathjax reverse the markdown parser ?

Answer 1

I've found a answer on my own but it is not very elegant. What I want is to unparse the text between $ $ and $$ $$. So I've done that :
$html = $this->container->get('markdown.parser')
->transformMarkdown($post->getContent());
$html = str_replace('&', '&', $html);
$html = str_replace('\', '\\\\', $html);
$html = str_replace('<em>', '_', $html);
$html = str_replace('</em>', '_', $html);
$post->setContent($html);
and in the view :
{{ post.content|raw }}
It is working but this is not beautifull at all.