MSVC compiles regex.c, so it must handle it. I'm fine with that.
msvc supports alloca, but regex.c doesn't make use of it per default
(you must define HAVE_ALLOCA_H in order to use it). basically _alloca
is fine for that task, but be aware that error handling on windows is
a bit compilicated. when _alloca fails it throws a structured
exception, you must reset the stack and use traditional memory
allocation as fallback. see
http://msdn.microsoft.com/en-us/library/wb1s57t5.aspx. :-)
janos