C ++在正则表达式中将wstring转换为字符串

Question

我有一些行

wstring const html = LR"(

<td><a href="4.%20Functions,%20scope.ppt">4. Functions, scope.ppt</a></td>
<td><a href="4.%20Functions,%20scope.ppt">4. Functions, scope.ppt</a></td>
<td><a href="4.%20Functions,%20scope.ppt">4. Functions, scope.ppt</a></td>
)";

// for convenience
const auto fast_n_loose = regex_constants::optimize | regex_constants::icase;
//icase: without case
//optimize: priority matching efficient


// extract href's
wregex const link{ LR"~(href=(["'])(.*?)\1)~", fast_n_loose };

int main()
{
    // regex iterators       
    string s (html.begin(), html.end());
    wsregex_iterator itr_end;
    wsregex_iterator itr{ begin(html), end(html), link };
    // iterate through the matches
    for (; itr != itr_end; itr++)
    {
        wcout << itr->str(2) << '\n';
    }
}

我尝试将wstring转换为字符串，但会犯很多错误。也许我对使用迭代器的一些结构错了。 我该怎么编辑？