id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6405	Assertion exception thrown when using boost::regex_match	ses44@…	John Maddock	"When attempting to do a regex match using the following code:

{{{
      bool isValidEmailAddr(const std::string & addr)
      {
        boost::regex reg(""((^|@)[[:alnum:]!#$%&'*+/=?^_`{|}~-]+(.[[:alnum:]!#$%&'*+/=?^_`{|}~-]+)*){2}$"");

        return boost::regex_match(addr, reg);
      }
}}}

on a linux box with boost 1.48, gcc version 4.4.6 i get the following error:

/usr/include/boost/smart_ptr/shared_ptr.hpp:418: typename boost::detail::shared_ptr_traits<T>::reference boost::shared_ptr<T>::operator*() const [with T = boost::regex_traits_wrapper<boost::regex_traits<char, boost::cpp_regex_traits<char> > >]: Assertion `px != 0' failed.
Aborted

Moving my code to my mac, compiling with boost 1.48, gcc 4.7 all seems to work fine.  

Additionally, if I try to print the regex on the linux box I get:

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct NULL not valid

I'm going to try to upgrade my linux box to gcc 4.7, but I would like to understand what the problem is.

Thanks much.

BTW - I noticed a bug report that indicates this may happen in multi-threaded environments due to some allocation rules, but this is a very simple single threaded test.

"	Bugs	closed	To Be Determined	regex	Boost 1.54.0	Problem	worksforme