[re.results.form]

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template<class OutputIter>
  OutputIter format(
    OutputIter out,
    const char_type* fmt_first, const char_type* fmt_last,
    regex_constants::match_flag_type flags = regex_constants::format_default) const;

Preconditions: ready() == true and OutputIter meets the requirements for a Cpp17OutputIterator ([output.iterators]).

Effects: Copies the character sequence [fmt_first, fmt_last) to OutputIter out.

Replaces each format specifier or escape sequence in the copied range with either the character(s) it represents or the sequence of characters within *this to which it refers.

The bitmasks specified in flags determine which format specifiers and escape sequences are recognized.

Returns: out.

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template<class OutputIter, class ST, class SA>
  OutputIter format(
    OutputIter out,
    const basic_string<char_type, ST, SA>& fmt,
    regex_constants::match_flag_type flags = regex_constants::format_default) const;

Effects: Equivalent to: return format(out, fmt.data(), fmt.data() + fmt.size(), flags);

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template<class ST, class SA>
  basic_string<char_type, ST, SA> format(
    const basic_string<char_type, ST, SA>& fmt,
    regex_constants::match_flag_type flags = regex_constants::format_default) const;

Effects: Constructs an empty string result of type basic_string<char_type, ST, SA> and calls: format(back_inserter(result), fmt, flags);

Returns: result.

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string_type format(
  const char_type* fmt,
  regex_constants::match_flag_type flags = regex_constants::format_default) const;

Effects: Constructs an empty string result of type string_type and calls: format(back_inserter(result), fmt, fmt + char_traits<char_type>::length(fmt), flags);

Returns: result.

28 Text processing library [text]

28.6 Regular expressions library [re]

28.6.9 Class template match_results [re.results]

28.6.9.6 Formatting [re.results.form]