id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4608	"boost::regex accepts invalid regular expressions like ""\\d++"""	gyk.net <gyk.net@…>	John Maddock	"In programming languages that don't support possessive quantifier,eg. Python and C#,""\d++"" is considered as an illegal nested quantifier.And in boost::xpressive,""\\d++"" will raise a runtime exception.However,it's valid in boost::regex.

{{{
wchar_t* s = L""abc123"" ;
wregex e(L""\\d+++"", boost::regex::normal) ;
wcmatch m ;

if(regex_search(s, m, e)){
    wcout <<  m[0] << endl ;
}
}}}

The output is 123."	Bugs	closed	To Be Determined	regex	Boost 1.44.0	Problem	fixed	regex