std::regex_token_iterator

 

C++

Language

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Regular expressions library

Classes

basic_regex (C++11)

sub_match (C++11)

match_results (C++11)

Algorithms

regex_match (C++11)

regex_search (C++11)

regex_replace (C++11)

Iterators

regex_iterator (C++11)

regex_token_iterator (C++11)

Exceptions

regex_error (C++11)

Traits

regex_traits (C++11)

Constants

syntax_option_type (C++11)

match_flag_type (C++11)

error_type (C++11)

 

template<     class BidirectionalIterator,     class CharT = typename std::iterator_traits<BidirectionalIterator>::value_type,     class Traits = std::regex_traits<CharT> > class regex_token_iterator		(since C++11)

std::regex_token_iterator is a read-only ForwardIterator that accesses the individual sub-matches of every match of a regular expression within the underlying character sequence. It can also be used to access the parts of the sequence that were not matched by the given regular expression (e.g. as a tokenizer).

On construction, it constructs an std::regex_iterator and on every increment it steps through the requested sub-matches from the current match_results, incrementing the underlying regex_iterator when incrementing away from the last submatch.

The default-constructed std::regex_token_iterator is the end-of-sequence iterator. When a valid std::regex_token_iterator is incremented after reaching the last submatch of the last match, it becomes equal to the end-of-sequence iterator. Dereferencing or incrementing it further invokes undefined behavior.

Just before becoming the end-of-sequence iterator, a std::regex_token_iterator may become a suffix iterator, if the index -1 (non-matched fragment) appears in the list of the requested submatch indexes. Such iterator, if dereferenced, returns a match_results corresponding to the sequence of characters between the last match and the end of sequence.

A typical implementation of std::regex_token_iterator holds the underlying std::regex_iterator, a container (e.g. std::vector<int>) of the requested submatch indexes, the internal counter equal to the index of the submatch, a pointer to std::match_results, pointing at the current submatch of the current match, and a std::match_results object containing the last non-matched character sequence (used in tokenizer mode).

Several specializations for common character sequence types are defined:

Defined in header <regex>
Type	Definition
cregex_token_iterator	regex_token_iterator<const char*>
wcregex_token_iterator	regex_token_iterator<const wchar_t*>
sregex_token_iterator	regex_token_iterator<std::string::const_iterator>
wsregex_token_iterator	regex_token_iterator<std::wstring::const_iterator>

Member types

Member type	Definition
value_type	std::sub_match<BidirectionalIterator>
difference_type	std::ptrdiff_t
pointer	const value_type*
reference	const value_type&
iterator_category	std::forward_iterator_tag
regex_type	basic_regex<CharT, Traits>

Member functions

(constructor)	constructs a new regex_token_iterator (public member function)
(destructor) (implicitly declared)	destructs a regex_token_iterator, including the cached value (public member function)
operator=	replaces a regex__tokeniterator (public member function)
operator== operator!=	compares two regex__tokeniterators (public member function)
operator* operator->	obtains a reference to the current submatch accesses a member of the current submatch (public member function)
operator++ operator++(int)	advances the regex_token_iterator to the next submatch (public member function)

Notes

It is the programmer's responsibility to ensure that the std::basic_regex object passed to the iterator's constructor outlives the iterator. Because the iterator stores a std::regex_iterator which stores a pointer to the regex, incrementing the iterator after the regex was destroyed results in undefined behavior.

Example

#include <fstream>
#include <iostream>
#include <algorithm>
#include <iterator>
#include <regex>
int main()
{
   std::string text = "Quick brown fox.";
   // tokenization (non-matched fragments)
   // Note that regex is matched only two times: when the third value is obtained
   // the iterator is a suffix iterator.
   std::regex ws_re("\\s+"); // whitespace
   std::copy( std::sregex_token_iterator(text.begin(), text.end(), ws_re, -1),
              std::sregex_token_iterator(),
              std::ostream_iterator<std::string>(std::cout, "\n"));
 
   // iterating the first submatches
   std::string html = "<p><a href=\"http://google.com\">google</a> "
                      "< a HREF =\"http://cppreference.com\">cppreference</a>\n</p>";
   std::regex url_re("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"", std::regex::icase);
   std::copy( std::sregex_token_iterator(html.begin(), html.end(), url_re, 1),
              std::sregex_token_iterator(),
              std::ostream_iterator<std::string>(std::cout, "\n"));
}

Output:

Quick
brown
fox.
http://google.com
http://cppreference.com