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====== C - C++ Strings - Search for patterns in strings ======

===== regex.hpp =====

<code cpp>
#pragma once

#include <vector>
#include <tuple>
#include <string>

// Return a list of the list of submatches of regex in input.
std::vector<std::vector<std::string>> getMatches(std::string input, std::string regex);

std::vector<std::string> getFirstMatch(std::string content, std::string pattern);
</code>

----

===== regex.cpp =====

<code cpp>
#include "regex.hpp"
#include <regex>

std::vector<std::vector<std::string>> getMatches(std::string content, std::string pattern)
{
  std::vector<std::vector<std::string>> result;
  std::regex regex(pattern);

  std::for_each(std::sregex_iterator(content.begin(), content.end(), regex), std::sregex_iterator(), [&](std::smatch match)
  {
    std::vector<std::string> subMatches;
    for (std::string subMatch : match)
    {
      subMatches.emplace_back(subMatch);
    }
    result.emplace_back(subMatches);
  });

  return result;
}


std::vector<std::string> getFirstMatch(std::string content, std::string pattern)
{
  std::vector<std::string> subMatches;
  std::smatch match;

  if (std::regex_search(content, match, std::regex(pattern)))
  {
    for (std::string subMatch : match)
    {
      subMatches.emplace_back(subMatch);
    }
  }

  return subMatches;
}
</code>

----

===== References =====

https://en.cppreference.com/w/cpp/regex/regex_iterator

https://en.cppreference.com/w/cpp/regex/regex_search