使用regex_iterator浏览HTML文件的标签
[英]Using regex_iterator to go through the tags of an HTML file
问题描述
I'm writing a web browser and trying to use regex_iterator to go through the tags of an HTML document and ultimately create a document tree. 
我正在编写一个Web浏览器，并尝试使用regex_iterator浏览HTML文档的标签并最终创建文档树。 First I need a regular expression that will get me an HTML tag. 首先，我需要一个可以获取HTML标签的正则表达式。 The following should print out each HTML tag 以下应打印出每个HTML标签
#include <string>
#include <regex>
#include <iostream>
int main()
{
std::string s("<!DOCTYPE html><head></head><body><div class='container' id='someId'><p>Here's a p tag</p><p>Here's another p tag</p></div></body>");
std::regex e("[someRegularExpression]");
std::regex_iterator<std::string::iterator> htmlTagRover ( s.begin(), s.end(), e );
std::regex_iterator<std::string::iterator> offend;
while (htmlTagRover != offend)
std::cout << htmlTagRover->str() << std::endl;
return 0;
}
if [someRegularExpression] is equal to a regular expression for an HTML tag. 如果[someRegularExpression]等于HTML标签的正则表达式。 Bur I'm getting the following error when I try to run the program: Bur，我尝试运行该程序时遇到以下错误：
/home/svzQOJ/ccEMKoqM.o: In function main': prog.cpp:(.text.startup+0xd1): undefined reference to std::regex_iterator<__gnu_cxx::__normal_iterator, char, std::regex_traits >::regex_iterator(__gnu_cxx::__normal_iterator, __gnu_cxx::__normal_iterator, std::basic_regex > const&, std::bitset<11u>)' prog.cpp:(.text.startup+0xdc): undefined reference to std::regex_iterator<__gnu_cxx::__normal_iterator<char*, std::string>, char, std::regex_traits<char> >::regex_iterator()' prog.cpp:(.text.startup+0x1af): undefined reference to std::regex_iterator<__gnu_cxx::__normal_iterator, char, std::regex_traits >::operator!=(std::regex_iterator<__gnu_cxx::__normal_iterator, char, std::regex_traits > const&)' prog.cpp:(.text.startup+0x1be): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator, char, std::regex_traits >::operator->()' collect2: error: ld returned 1 exit status /home/svzQOJ/ccEMKoqM.o：在函数main': prog.cpp:(.text.startup+0xd1): undefined reference to std :: regex_iterator <__ gnu_cxx :: __ normal_iterator，char，std :: regex_traits> :: regex_iterator的main': prog.cpp:(.text.startup+0xd1): undefined reference to （__gnu_cxx :: __ normal_iterator，__gnu_cxx :: __ normal_iterator，std :: basic_regex> const＆，std :: bitset <11u>）'prog.cpp :(。text.startup + 0xdc）：对std::regex_iterator<__gnu_cxx::__normal_iterator<char*, std::string>, char, std::regex_traits<char> >::regex_iterator()' prog.cpp:(.text.startup+0x1af): undefined reference to未定义引用std::regex_iterator<__gnu_cxx::__normal_iterator<char*, std::string>, char, std::regex_traits<char> >::regex_iterator()' prog.cpp:(.text.startup+0x1af): undefined reference to std :: regex_iterator <__ gnu_cxx的std::regex_iterator<__gnu_cxx::__normal_iterator<char*, std::string>, char, std::regex_traits<char> >::regex_iterator()' prog.cpp:(.text.startup+0x1af): undefined reference to :: __ normal_iterator，char，std :: regex_traits> :: operator！=（std :: regex_iterator <__ gnu_cxx :: __ normal_iterator，char，std :: regex_traits> const＆）'prog.cpp :(。text.startup + 0x1be）：未定义对`std :: regex_iterator <__ gnu_cxx :: __ normal_iterator，char，std :: regex_traits> :: operator->（）'的引用collect2：错误：ld返回1退出状态
Any idea why? 知道为什么吗？
1 个解决方案
解决方案1
0 2014-11-26 17:44:38
根据这里 ，您在调用中不需要<std::string::iterator> ，您需要使用std :: sregex_iterator（注意s）将正则表达式与std :: string一起使用。
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