centos安装devtoolset-3支持gcc 4.9.2

wget https://www.softwarecollections.org/repos/rhscl/devtoolset-3/epel-6-x86_64/noarch/rhscl-devtoolset-3-epel-6-x86_64-1-2.noarch.rpm rpm -ivh rhscl-devtoolset-3-epel-6-x86_64-1-2.noarch.rpm

wget https://www.softwarecollections.org/repos/rhscl/devtoolset-3/epel-7-x86_64/noarch/rhscl-devtoolset-3-epel-7-x86_64-1-2.noarch.rpm rpm -ivh rhscl-devtoolset-3-epel-7-x86_64-1-2.noarch.rpm

yum install devtoolset-3-toolchain

scl enable devtoolset-3 bash

#include <string>
#include <regex>
#include <stdio.h>

int main() {
std::string r("(0x[\\dA-Fa-f]+)");
std::regex pattern(r);

std::match_results<std::string::const_iterator> result;
std::string source = "0x123fd";
bool valid = std::regex_match(source, result, pattern);
if (!valid) {
printf("no vaild");
return 0;
}

printf("match result is %s", result[1].str().c_str());
return 0;
}

g++ -o test test.cpp -std=c++11

./test

match result is 0x123fd