Регулярные выражения

#include <iostream>
#include <string>
#include <regex>
 
int main ()
{
  std::string s ("this subject has a submarine as a subsequence");
  std::smatch m;
  std::regex e ("\\b(sub)([^ ]*)");   // matches words beginning by "sub"
 
  std::cout << "Target sequence: " << s << std::endl;
  std::cout << "Regular expression: /\\b(sub)([^ ]*)/" << std::endl;
  std::cout << "The following matches and submatches were found:" << std::endl;
 
  while (std::regex_search (s,m,e)) {
    for (auto x:m) std::cout << x << " ";
    std::cout << std::endl;
    s = m.suffix().str();
  }
 
  return 0;
}

#error This file requires compiler and library support for the upcoming \
ISO C++ standard, C++0x. This support is currently experimental, and must be \
enabled with the -std=c++0x or -std=gnu++0x compiler options.

#include <iostream>
#include <string>
#include <boost\regex.hpp>
using namespace boost;
int main ()
{
  std::string s ("this subject has a submarine as a subsequence");
  boost::smatch m;
  boost::regex e ("\\b(sub)([^ ]*)");   // matches words beginning by "sub"
//std::__search_n()
  std::cout << "Target sequence: " << s << std::endl;
  std::cout << "Regular expression: /\\b(sub)([^ ]*)/" << std::endl;
  std::cout << "The following matches and submatches were found:" << std::endl;
 
  while (boost::regex_search (s,m,e)) {
    for (int i=0;i<100;i++) std::cout << i << " ";
    std::cout << std::endl;
    s = m.suffix().str();
  }
 
  return 0;
}

std::string txt = "[10] 21 15 [2.9]";
    boost::regex reg("\[[0-9.]+\]");

std::string txt = "[10] 21 15 [2.9]";
boost::regex reg("\\[\\d+\\.\\d*\\]");