# std::regex_iterator::regex_iterator

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< cpp‎ | regex‎ | regex iterator

regex_iterator(); | (1) | (since C++11)
regex_iterator(BidirIt a, BidirIt b, const regex_type& re, std::regex_constants::match_flag_type m = std::regex_constants::match_default); | (2) | (since C++11)
regex_iterator(const regex_iterator&); | (3) | (since C++11)
regex_iterator(BidirIt, BidirIt, const regex_type&&, std::regex_constants::match_flag_type = std::regex_constants::match_default) = delete; | (4) | (since C++14)

Constructs a new `regex_iterator`:

1) Default constructor. Constructs an end-of-sequence iterator.
2) Constructs a `regex_iterator` from the sequence of characters `[a, b)`, the regular expression `re`, and a flag `m` that governs matching behavior. This constructor performs an initial call to std::regex_search with this data. If the result of this initial call is false, *this is set to an end-of-sequence iterator.
3) Copies a `regex_iterator`.
4) The overload 2 is not allowed to be called with a temporary regex, since the returned iterator would be immediately invalidated.

### Parameters

a | - | `BidirIt` to the beginning of the target character sequence
b | - | `BidirIt` to the end of the targe character sequence
re | - | regular expression used to search the target character sequence
m | - | flags that govern the behavior of `re`

### Example

| This section is incomplete Reason: no example

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