#include <iostream>
#include <regex>
using namespace std;

void show_matches(const std::string& in, const std::string& re)
{
    std::smatch m;
    std::regex_search(in, m, std::regex(re));
    if (!m.empty())
    {
        std::cout << "input=[" << in << "], regex=[" << re << "]\n  "
                     "prefix=[" << m.prefix() << "]\n  smatch: ";
        for (std::size_t n = 0; n < m.size(); ++n)
            std::cout << "m[" << n << "]=[" << m[n] << "] ";
        std::cout << "\n  suffix=[" << m.suffix() << "]\n";
    }
    else
        std::cout << "input=[" << in << "], regex=[" << re << "]: NO MATCH\n";
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
    char str[] = "annex32_1.47.5";
  if(regex_search(str,regex("annex")))
  Serial.println("match");
  else
  Serial.println("not match");

  show_matches("abcdefghi", "a[a-z]{2,4}");

  String pippo = "azazzerellabis";
  show_matches(pippo.c_str(), "gg(azaz)(zere)");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}