id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7744	make_u32regex() performs insufficient UTF-8 validation	anonymous	John Maddock	"The program below shows a segfault for regular expression "".*\xf6.*"". AFAIK the maximum value allowed as leading byte for 4-byte sequences is 0xF4. I would expect an exception.

Regular expression "".*\xe4.*"" is created without exception. However 0xE4 starts a 3-byte character and no trailing bytes are present. I would expect an exception here too.

We use Boost 1.52.0 together with ICU 50.1. The behavior is the same in Linux and Windows.

{{{
#include <boost/regex/icu.hpp>

int main(void)
{
    // this line does not throw an exception although this is not valid UTF-8
    boost::u32regex(boost::make_u32regex("".*\xe4.*""));
    // this line segfaults
    boost::u32regex(boost::make_u32regex("".*\xf6.*""));
    return 0;
}
}}}"	Bugs	closed	To Be Determined	regex	Boost 1.52.0	Problem	fixed