Using regex_iterator to go through the tags of an HTML file
Question
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. First I need a regular expression that will get me an HTML tag. The following should print out each HTML tag
#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. Bur I'm getting the following error when I try to run the program:
/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
Any idea why?
1 answers
solution1
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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