boost::regex match_count off by 1

[spoo@…]

#include <boost/regex.hpp>

int main(int, char **)
{
	boost::regex r("(a)");
	std::cout << r.mark_count(); 
	return 0;
}

prints out "2" instead of "1". Both libc++ and libstdc++ print out "1".

This was discussed in 2007 as well I believe, but I couldn't find any other mention of the issue: [regex] regex::mark_count() incorrect? (I can't post the link since trac rejects my submission)

[John Maddock]

Fixed in Git develop