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# std::regex_token_iterator::regex_token_iterator

From cppreference.com
< cpp‎ | regex‎ | regex token iterator

regex_token_iterator(); | (1) | (since C++11)
regex_token_iterator( BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, int submatch = 0, std::regex_constants::match_flag_type m = std::regex_constants::match_default ); | (2) | (since C++11)
regex_token_iterator( BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, const std::vector<int>& submatches, std::regex_constants::match_flag_type m = std::regex_constants::match_default ); | (3) | (since C++11)
regex_token_iterator( BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, std::initializer_list<int> submatches, std::regex_constants::match_flag_type m = std::regex_constants::match_default ); | (4) | (since C++11)
template <std::size_t N> regex_token_iterator( BidirectionalIterator a, BidirectionalIterator b, const regex_type& re, const int (&submatches)[N], std::regex_constants::match_flag_type m = std::regex_constants::match_default ); | (5) | (since C++11)
regex_token_iterator( const regex_token_iterator& other ); | (6) | (since C++11)

Constructs a new `regex_token_iterator`:

1) Default constructor. Constructs the end-of-sequence iterator.
2-5) First, copies the list of the requested submatch out of the `submatches` or `submatch` argument into the member list stored in the iterator and constructs the member std::regex_iterator by passing `a`, `b`, `re`, and `m` to its four-argument constructor (that constructor performs the initial call to std::regex_search) and sets the internal counter of submatches to zero.

- If, after construction, the member `regex_iterator` is not an end-of-sequence iterator, sets the member pointer to the address of the current std::sub_match.
- Otherwise (if the member `regex_iterator` is an end-of-sequence iterator), but the value -1 is one of the values in `submatches`/`submatch`, turns `*this` into a suffix iterator pointing at the range `[a,b)` (the entire string is the non-matched suffix)
- Otherwise (if -1 is not in the list of submatches), turns `*this` into the end-of-sequence iterator.

The behavior is undefined if any value in `submatches` is less than -1.

6) Copy constructor: performs member-wise copy (including making a copy of the member `regex_iterator` and the member pointer to current sub_match).

### [edit] Parameters

a | - | `BidirectionalIterator` to the beginning of the target character sequence
b | - | `BidirectionalIterator` to the end of the target character sequence
re | - | regular expression used to search the target character sequence
submatch | - | the index of the submatch that should be returned. "0" represents the entire match, and "-1" represents the parts that are not matched (e.g, the stuff between matches).
submatches | - | the sequence of submatch indices that should be iterated over within each match, may include the special value -1 for the non-matched fragments
m | - | flags that govern the behavior of `re`

### [edit] Example

| This section is incomplete Reason: no example

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