id summary reporter owner description type status milestone component version severity resolution keywords cc 12965 bug of [[:xdigit:]] matching freeman_feng@… John Maddock " boost::regex myRegex{ ""[[:xdigit:]]{ 1,2 }"" };// string s = ""\xca\xd5""; cout << boost::regex_match(s,myRegex) << endl;" Bugs new To Be Determined regex Boost 1.63.0 Problem