attribute parser

main.cpp

#include <iostream>
#include <sstream>
#include <string>
#include <regex>

using namespace std;

int main()
{
    ostringstream oss;

    /*
    oss << "<tag1 value = \"HelloWorld\">" << endl;
    oss << "<tag2 name = \"Name1\">" << endl;
    oss << "</tag2>" << endl;
    oss << "</tag1>" << endl;
    */

    oss << R"(<tag-name attribute1-name = "value1" attribute2-name = "value2">)";
    oss << R"(</tag-name>)";

    string s = oss.str();
    /* cout << s; */

    try {
        string word = "[a-z\\-_A-Z0-9]+";
        regex ot_rx {
            "<(" + word + ")( (" + word + ") = \"(" + word + ")\")+>"
        };

        auto it = sregex_iterator(s.begin(), s.end(), ot_rx);
        auto end = sregex_iterator();

	while (it != end) {
	    smatch match = *it;
            cout << "size: " << match.size() << endl;

            if (match.size() > 1) {
                cout << "tag_name: " << match[1] << endl;
            }

            for (size_t i = 3; i < match.size(); ++i) {
                if (i % 2 != 0)
                    cout << "attr_name: " << match[i] << endl;
                else
                    cout << "attr_value: " << match[i] << endl;
            }

	    it++;

            cout << endl;
	} 

    } catch (regex_error& e) {
        cerr << "Error: " << e.what() << endl;
        exit(1);
    }
}

output:

size: 5
tag_name: tag-name
attr_name: attribute2-name
attr_value: value2