drdrang/php-markdown-extra-math — pull request #2 by QuLogic (2014-04-12 02:45:19+00:00)
Title: Enable multi-line display math.

To the display math regex, this commit adds
* 's' flag, which allows '.' to match newlines,
* 'U' flag, which makes expression ungreedy, so that a bunch of display math blocks are not treated as one.