32 Regular expressions library [re]

32.8 Class template sub_match [re.submatch]

32.8.2 Members [re.submatch.members]

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constexpr sub_match();
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Effects: Value-initializes the pair base class subobject and the member matched.
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difference_type length() const;
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Returns: matched ? distance(first, second) : 0.
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operator string_type() const;
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Returns: matched ? string_type(first, second) : string_type().
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string_type str() const;
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Returns: matched ? string_type(first, second) : string_type().
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int compare(const sub_match& s) const;
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Returns: str().compare(s.str()).
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int compare(const string_type& s) const;
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Returns: str().compare(s).
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int compare(const value_type* s) const;
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Returns: str().compare(s).
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void swap(sub_match& s) noexcept(see below);
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Preconditions: BidirectionalIterator meets the Cpp17Swappable requirements ([swappable.requirements]).
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Effects: Equivalent to: this->pair<BidirectionalIterator, BidirectionalIterator>::swap(s); std::swap(matched, s.matched);
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Remarks: The exception specification is equivalent to is_nothrow_swappable_v<BidirectionalIterator>.