tmp/tmpj_2yudxy/{from.md → to.md}
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### General <a id="re.submatch.general">[[re.submatch.general]]</a>
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Class template `sub_match` denotes the sequence of characters matched by
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a particular marked sub-expression.
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``` cpp
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namespace std {
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template<class BidirectionalIterator>
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class sub_match : public pair<BidirectionalIterator, BidirectionalIterator> {
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public:
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using value_type =
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typename iterator_traits<BidirectionalIterator>::value_type;
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using difference_type =
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typename iterator_traits<BidirectionalIterator>::difference_type;
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using iterator = BidirectionalIterator;
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using string_type = basic_string<value_type>;
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bool matched;
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constexpr sub_match();
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difference_type length() const;
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operator string_type() const;
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string_type str() const;
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int compare(const sub_match& s) const;
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int compare(const string_type& s) const;
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int compare(const value_type* s) const;
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void swap(sub_match& s) noexcept(see below);
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};
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}
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```
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