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std::regex_token_iterator::regex_token_iterator

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< cpp‎ | regex‎ | regex token iterator
Revision as of 13:20, 22 March 2014 by Cubbi (Talk | contribs)

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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)
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 ) = delete;
(7) (since C++14)
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 ) = delete;
(8) (since C++14)
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 ) = delete;
(9) (since C++14)
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 ) = delete;
(10) (since C++14)

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).
7-10) The overloads 2-5 are prohibited from being called with a temporary regex since otherwise the returned iterator would be immediately invalidated

[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