PCRECPP（pcre）从url代码中提取主机名问题 [英] PCRECPP (pcre) extract hostname from url code problem

问题描述

我在c ++中有这段简单的代码：

I have this simple piece of code in c++:

int main(void)
    {
        string text = "http://www.amazon.com";
        string a,b,c,d,e,f;
        pcrecpp::RE re("^((\\w+):\\/\\/\\/?)?((\\w+):?(\\w+)?@)?([^\\/\\?:]+):?(\\d+)?(\\/?[^\\?#;\\|]+)?([;\\|])?([^\\?#]+)?\\??([^#]+)?#?(\\w*)");
        if(re.PartialMatch(text, &a,&b,&c,&d,&e,&f)) 
        {
            std::cout << "match: " << f << "\n";
            // should print "www.amazon.com"
        }else{
            std::cout << "no match. \n";
        }       
        return 0;
    }

当我运行它时没有找到匹配。
我确信regex模式是正确的，我的代码是什么问题。

When I run this it doesn't find a match. I pretty sure that the regex pattern is correct and my code is what's wrong. If anyone familiar with pcrecpp can take a look at this Ill be grateful.

编辑：
感谢 Dingo ，它工作的很好。

另一个问题是，结果是在第六位 - f。

我编辑了上面的代码，以便您可以复制/粘贴。

Thanks to Dingo, it works great.
another issue I had is that the result was at the sixth place - "f".
I edited the code above so you can copy/paste if you wish.

推荐答案

是你的代码包含 ??（这是C ++中的 [三字母或做某事来打破它们：

The problem is that your code contains ??( which is a trigraph in C++ for [. You'll either need to disable trigraphs or do something to break them up like:

pcrecpp::RE re("^((\\w+):\\/\\/\\/?)?((\\w+):?(\\w+)?@)?([^\\/\\?:]+):?(\\d+)?(\\/?[^\\?#;\\|]+)?([;\\|])?([^\\?#]+)?\\??" "([^#]+)?#?(\\w*)"); 

这篇关于PCRECPP（pcre）从url代码中提取主机名问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！