30 Regular expressions library [re]

30.10 Class template match_­results [re.results]

30.10.5 Formatting [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;
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Preconditions: ready() == true and OutputIter meets the requirements for a Cpp17OutputIterator ([output.iterators]).
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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.
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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;
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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;
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Preconditions: ready() == true.
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Effects: Constructs an empty string result of type basic_­string<char_­type, ST, SA> and calls: 
format(back_inserter(result), fmt, flags);
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Returns: result.
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string_type format( const char_type* fmt, regex_constants::match_flag_type flags = regex_constants::format_default) const;
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Preconditions: ready() == true.
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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);
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Returns: result.