Hello. All I see that is that it is a survey, I wonder what kind of tests that are used to draw the conclusions. I also see for instances that the regexp.h fil

Hello. All I see that is that it is a survey, I wonder what kind of tests that are used to draw the conclusions. I also see for instances that the regexp.h file is absent for OS X Lion, which is reworked to work wide wide characters. But, the header files may fail in ways I don't know about, that is why I ask for the tests that makes up for the results.