Retrieve all values that match a json path #743

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1. nlohmann commented on Sep 14, 2017

   

   nlohmann

   on Sep 14, 2017

   Owner

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   What about

   #include "json.hpp"
   #include <iostream>
   #include <regex>
   
   using json = nlohmann::json;
   
   int main(int argc, char const *argv[])
   {
     json j = R"({
       "array": [
       {
         "a": 1,
         "b": [10,11,12]
       },
       {
         "a": 2,
         "b": [20,21,22]
       },
       {
         "a": 3,
         "b": [30,31,32]
       }
       ],
       "cost": 1
     })"_json;
   
     auto f = j.flatten();
   
     std::smatch sm;
     std::regex re("/array/[^/]+/a");
   
     json result;
   
     for (auto it = f.begin(); it != f.end(); ++it)
     {
       std::regex_search(it.key(), sm, re);
       if(not sm.empty())
       {
         result.push_back(it.value());
       }
     }
   
     std::cout << result << std::endl;        
   }
3. nlohmann commented on Sep 14, 2017

   

   nlohmann

   on Sep 14, 2017

   Owner

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   No, but you must admit that this is a very specific usecase... And I think you could clean up the code above and use some <algorithm> magic.
4. nlohmann

   added

   kind: question

   solution: proposed fixa fix for the issue has been proposed and waits for confirmationa fix for the issue has been proposed and waits for confirmation

   on Sep 14, 2017
5. nlohmann

   closed this as completedon Sep 14, 2017
7. nlohmann commented on Sep 14, 2017

   

   nlohmann

   on Sep 14, 2017

   Owner

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   I don't know, maybe something like std::copy_if.