Hi,
I have a problem using boost.regex to parse a message.
The message contains an unknown number of handles terminated by a tab.
Each handle has four hex digits. To find the block of handles I use
a regex search and then I want to use an iterator to split up the block.
#include <iostream>
#include
#include <string>
int main (int argc, char *argv[])
{
std::string input("HEAD123456789abcdef0\t");
try {
std::cout << "creating regex" << std::endl;
boost::regex reg("^HEAD(([a-fA-F0-9]{4})+)\\t");
boost::smatch sm;
std::cout << "searching " << input << std::endl;
boost::regex_search(input, sm, reg);
boost::sregex_iterator end;
boost::regex handles("([a-fA-F0-9]{4})");
boost::sregex_iterator it(sm[1].str().begin(), sm[1].str().end(),
handles);
while (it != end)
{
std::cout << *it++ << std::endl;
}
}
catch (...)
{
std::cout << "Exception" << std::endl;
}
}
I get a segmentation fault if I run this - sometimes with a memory
exhausted notice.
If I replace the iterator line
boost::sregex_iterator it(sm[1].str().begin(), sm[1].str().end(), handles);
with
const string& hs(sm[1].str());
boost::sregex_iterator it(hs.begin(), hs.end(), handles);
then everything seems to work.
What's going on here? Is there a simpler way of achieving this?
thanks
dan
