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Showing content from https://cplusplus.github.io/LWG/issue2213 below:

Issue 2213: Return value of std::regex_replace

template <class OutputIterator, class BidirectionalIterator,
  class traits, class charT, class ST, class SA>
OutputIterator
regex_replace(OutputIterator out, BidirectionalIterator first, BidirectionalIterator last,
  const basic_regex<charT, traits>& e, const basic_string<charT, ST, SA>& fmt,
  regex_constants::match_flag_type flags = regex_constants::match_default);
template <class OutputIterator, class BidirectionalIterator,
  class traits, class charT>
OutputIterator
regex_replace(OutputIterator out, BidirectionalIterator first, BidirectionalIterator last,
  const basic_regex<charT, traits>& e, const charT* fmt,
  regex_constants::match_flag_type flags = regex_constants::match_default);

-1- Effects: Constructs a regex_iterator object i as if by regex_iterator<BidirectionalIterator, charT, traits> i(first, last, e, flags), and uses i to enumerate through all of the matches m of type match_results<BidirectionalIterator> that occur within the sequence [first, last). If no such matches are found and !(flags & regex_constants ::format_no_copy) then calls out =std::copy(first, last, out). If any matches are found then, for each such match, if !(flags & regex_constants::format_no_copy), calls out =std::copy(m.prefix().first, m.prefix().second, out), and then calls out =m.format(out, fmt, flags) for the first form of the function and out =m.format(out, fmt, fmt + char_traits<charT>::length(fmt), flags) for the second. Finally, if such a match is found and !(flags & regex_constants ::format_no_copy), calls out =std::copy(last_m.suffix().first, last_m.suffix().second, out) where last_m is a copy of the last match found. If flags & regex_constants::format_first_only is non-zero then only the first match found is replaced.

-2- Returns: out.

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