id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13446	\R does not match \v and \n when combined with flag no_escape_in_lists	youcef.l@…	John Maddock	"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
}}}

Compiler: Visual Studio 2017, toolset=v141, VC15.5.1
"	Bugs	new	To Be Determined	regex	Boost 1.66.0	Regression		regex