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Showing content from https://en.cppreference.com/w/cpp/language/../regex/basic_regex/../match_results/begin.html below:

std::match_results<BidirIt,Alloc>::begin, std::match_results<BidirIt,Alloc>::cbegin - cppreference.com

iterator begin() noexcept;

(since C++11)

const_iterator begin() const noexcept;

(since C++11)

const_iterator cbegin() const noexcept;

(since C++11)

Returns an iterator to the beginning of the list of sub-matches. If match was successful, the iterator will point to the entire matched expression.

[edit] Parameters

(none)

[edit] Return value

Iterator to the first sub-match.

[edit] Complexity

Constant.

[edit] See also returns iterator to the end of the list of sub-matches
(public member function) [edit]

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