Support line break in ```math``` about mdmath HOT 3 CLOSED

@zhanglix
In fact I suspected the 'newline' bug with markdown-it rules. So I didn't even had a look at thoses regex's.

In the end I replaced the (.+?) with '([^`]+?)' which is a bit more performant than your proposal. Both replacements are working like a charme.

Thanks for setting me on the right track.

btw: We can use those backticks inside of TeX by \backprime.

from mdmath.

I am able to reproduce this ...
... so I need to have a deeper look into this.

I will come back to here .. may need some time for that.

Thanks

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@goessner
I think the problem relates to the regex in

https://github.com/goessner/markdown-it-texmath/blob/master/texmath.js

rex: /`{3}math\s+?(.+?)\s+?`{3}/gmy,

"(.+?)" will not math line terminators. Maybe a quick fix is replace it with "((?:.|\s)+?)"

rex: /`{3}math\s+?((?:.|\s)+?)\s+?`{3}/

It works for me now 😆

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