Regex support in inlineMath

[benoitdr]

To align docsify-latex behavior on pandoc, it would be useful to support regex in docsify inlineMath option.

From pandoc documentation :
Anything between two $ characters will be treated as TeX math. The opening $ must have a non-space character immediately to its right, while the closing $ must have a non-space character immediately to its left, and must not be followed immediately by a digit. Thus, $20,000 and $30,000 won’t parse as math.

Having regex support in inlineMath options would allow to have the same logic :

window.$docsify = {
  // ...
  latex: {
    inlineMath   : [['<regex here>', <regex here>']]
  }
};