regex \R with flag no_escape_in_lists does not match \v and \n

[youcefl]

I think this is a regression. The following code

#include <iostream>
#include <boost/regex.hpp>

int main(int argc, char** argv)
{
	auto backslashR = boost::regex("\\R", boost::regex_constants::no_escape_in_lists);

	std::cout << std::boolalpha;
	std::cout << "regex='\\R', text='\\r', match found: " << boost::regex_search("\r", backslashR) << std::endl;
	std::cout << "regex='\\R', text='\\n', match found: " << boost::regex_search("\n", backslashR) << std::endl;
	std::cout << "regex='\\R', text='\\v', match found: " << boost::regex_search("\v", backslashR) << std::endl;

	return 0;
}

outputs

regex='\R', text='\r', match found: true
regex='\R', text='\n', match found: true
regex='\R', text='\v', match found: true

using boost regex v1.55 and v1.64. Using version 1.66 I get this:

regex='\R', text='\r', match found: true
regex='\R', text='\n', match found: false
regex='\R', text='\v', match found: false

[jzmaddock]

Confirmed, fixed in develop.