Initialize a map with regex - c++

Question

I'm using a very nice and simple std::vector<std::string> initializer which takes an input string and regex. It's similar to a basic split, just it works with regex Group1 matches:
static std::vector<std::string> match(const std::string& str, const std::regex& re) {
return { std::sregex_token_iterator(str.begin(), str.end(), re, 1), std::sregex_token_iterator() };
}
Construction of a vector is done like below:
std::string input = "aaa(item0,param0);bbb(item1,param1);cc(item2,param2);";
std::vector<std::string> myVector = match(input, std::regex(R"(\(([^,]*),)"));
This results a vector containing item0,item1,item2 extracted from an input string with regex:
Now my match function uses the first group results of the regex and (I believe) utilizes the vector's intialization form of:
std::vector<std::string> myVector = { ... };
I'd like to create a similar match function to construct a std::map<std::string,std::string>. Map also has the above initializator:
std::map<std::string,std::string> myMap = { {...}, {...} };
My idea is to modify the regex to create more group results:
And I would like to modify the above match function to create a nice map for me with the modified regex (\(([^,]*),([^)]*)), resulting the same as this:
std::map<std::string,std::string> myMap = { {"item0", "param0"}, {"item1", "param "}, {"item2", "param2"}, };
What I've tried?
static std::map<std::string, std::string> match(const std::string& str, const std::regex& re) {
return { std::sregex_token_iterator(str.begin(), str.end(), re, {1,2}), std::sregex_token_iterator() };
}
This one (in case of a vector) would put both Group1 and Group2 results into the vector. But it can not initialize a map.
How can I still do that easily (Is it not possible with sregex_token_iterator)?

Answer 1

I don't know what 'easily' does mean exactly, so here comes simple solution:
#include <iostream>
#include <regex>
#include <vector>
static std::map<std::string, std::string> match(const std::string& str, const std::regex& re) {
std::map<std::string, std::string> retVal;
auto token = std::sregex_token_iterator(str.begin(), str.end(), re, {1,2});
for (auto it=token++, jt=token; it != std::sregex_token_iterator(); ++it, jt = it++)
retVal.emplace(*it,*jt);
return retVal;
}
int main() {
std::string input = "aaa(item0,param0);bbb(item1,param1);cc(item2,param2);";
auto myVector = match(input, std::regex(R"(\(([^,]*),([^)]*))"));
for (const auto& item : myVector)
std::cout<<item.first<<'\t'<<item.second<<std::endl;
}
You can also could try to use boost and homemade generic algorithm.