regex expression guidance

Question

apologies but am completely unaware of regex matching. therefore wanted to ask if someone can guide for creating a regex for following line (language C#)

$ ... $ <- anything that is within a $ .. $

and also for the following

$$ ... $$ <- anything that is within a $$ .. $$

the expressions may be as follows:

$ \[a\] + \[b\] + 23 $

to explain the requirement further, we are using MathJax and the input for mathjax is being taken from a rich textbox control (jqte).

but sometimes jqte injects its own html which does not render inside MathJax .

so the idea was to sanitize any input that is inside a MathJax expression and remove any HTML so that it can render properly.

Note: The [a] [b] etc are other variables that are assigned random values at runtime .

any help appreciated

Answer 1

Which regex engine are you using?

I have found some working examples but you need to test them on your own:

\$(.*?)\$

Or for the second one

\$\$(.*?)\$\$

You can use both at the same time with the | Operator (Note that this will create three matches with one non-empty group each)

Reference