Still learning C++. I'm writing some regex using boost. It works great.
Only thing is... this code seems slow to me compared to equivelent Perl
and Python. I'm sure I'm doing something incorrect. Any tips?

#include <boost/regex.hpp>
#include <iostream>

// g++ numbers.cpp -o numbers -I/usr/local/include/boost-1_35
/usr/local/lib/libboost_regex-gcc41-mt-s.a
// g++ numbers.cpp -o numbers.exe
-Ic://Boost/include/boost-1_35://Boost/lib/libboost_regex-mgw34-mt-s.lib

void number_search(const std::string& portion)
{

static const boost::regex Numbers("\\b\\d{9}\\b");
static const boost::regex& rNumbers = Numbers;
boost::smatch matches;

std::string::const_iterator Start = portion.begin();
std::string::const_iterator End = portion.end();

while (boost::regex_search(Start, End, matches, rNumbers))
{
std::cout << matches.str() << std::endl;
Start = matches[0].second;
}
}

int main ()
{
std::string portion;
while (std::getline(std::cin, portion))
{
number_search(portion);
}
return 0;
}