相关疑难解决方法(0)

我试图在C++ 11代码中使用std :: regex,但看起来支持有点儿错误.一个例子:

#include <regex>
#include <iostream>

int main (int argc, const char * argv[]) {
    std::regex r("st|mt|tr");
    std::cerr << "st|mt|tr" << " matches st? " << std::regex_match("st", r) << std::endl;
    std::cerr << "st|mt|tr" << " matches mt? " << std::regex_match("mt", r) << std::endl;
    std::cerr << "st|mt|tr" << " matches tr? " << std::regex_match("tr", r) << std::endl;
}

输出:

st|mt|tr matches st? 1
st|mt|tr matches mt? 1
st|mt|tr matches tr? 0

当使用gcc(MacPorts gcc47 4.7.1_2)4.7.1编译时,使用

g++ *.cc -o test -std=c++11 …

可能重复:
与c ++ 11正则表达式不匹配

我boost::regex以前用过一些东西和一些我想要使用的新东西,std::regex直到我注意到以下不一致 - 所以问题是哪一个是正确的？

#include <iostream>
#include <regex>
#include <string>

#include <boost/regex.hpp>

void test(std::string prefix, std::string str)
{
  std::string pat = prefix + "\\.\\*.*?";

  std::cout << "Input   : [" << str << "]" << std::endl;
  std::cout << "Pattern : [" << pat << "]" << std::endl;

  {
    std::regex r(pat);
    if (std::regex_match(str, r))
      std::cout << "std::regex_match: true" << std::endl;
    else
      std::cout << "std::regex_match: false" << std::endl;

    if (std::regex_search(str, r))
      std::cout << "std::regex_search: true" << …

我一直在使用C++中的正则表达式,但遇到了一些错误:

这是我的剧本

#include <iostream>
#include <regex>
using namespace std;

string input(string prompt)
{
    cout << prompt;
    string str;
    cin >> str;
    return str;
}

int main() {
    string str;
    while (true) {

        str = input("Enter some text: ");
        regex e("([:w:])+", regex_constants::icase);

        bool match = regex_match(str, e);

        cout << (match? "Matched" : "Not matched") << endl;
    }
}

当我编译它并运行(g++ -std=c++11 test.cpp && ./a.out)时,我收到以下错误:

Enter some text: abcde
terminate called after throwing an instance of 'std::regex_error'
  what():  regex_error
Aborted (core …

可能重复:
关于正则表达式的gcc4.7错误吗？

我用"g ++ test.cpp -std = gnu ++ 0x"编译下面的代码.编译是成功的,但是当我运行./a.out时,它会给出错误,就像我不明白它为什么会发生一样.我的操作系统是Mint.

错误:"在抛出'std :: regex_error'的实例后调用终止what():regex_error Aborted(core dumped)"

Code:
// regex_match example
#include <iostream>
#include <string>
#include <regex>

using namespace std;

int main ()
{
  string s ("this subject has a submarine as a subsequence");
  regex e("sub[a-z]");   // matches words beginning by "sub"
  smatch m;

  return 0;
}