C++正则匹配字符串

#include <iostream>
#include <regex>

using namespace std;

int main()
{
    smatch results;
    string str = "adbhjasdhaj1231.123QWEE QWEQWWQEDXQ 12346.4156";
    string pat("\\d+\\.\\d+");
    regex r(pat);

    // 方法1：
    for (sregex_iterator it(str.begin(), str.end(), r), end_it; it != end_it; ++it)
    {
        cout << it->str() << endl;
    }
    return 0;
}