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std::regex_token_iterator

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< cpp‎ | regex

 
 
Regular expressions bibliothèque
Classes
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Classes
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basic_regex (C++11)
sub_match (C++11)
match_results (C++11)
Algorithmes
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Algorithms
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regex_match (C++11)
regex_search (C++11)
regex_replace (C++11)
Les itérateurs
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Iterators
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regex_iterator (C++11)
regex_token_iterator (C++11)
Exceptions
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Exceptions
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regex_error (C++11)
Traits
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Traits
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regex_traits (C++11)
Constantes
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Constants
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syntax_option_type (C++11)
match_flag_type (C++11)
error_type (C++11)
 
template<

    class BidirIt,
    class CharT = typename std::iterator_traits<BidirIt>::value_type,
    class Traits = std::regex_traits<CharT>

> class regex_token_iterator
(depuis C++11)
std::regex_token_iterator est un ForwardIterator en lecture seule qui permet d'accéder aux différents sous-correspondances de chaque match d'une expression régulière dans la chaîne de caractères sous-jacent. Il peut également être utilisé pour accéder aux parties de la séquence qui n'ont pas été correspondant à l'expression rationnelle donnée (par exemple, en tant que tokenizer) .
Original:
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).
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Sur la construction, il construit un std::regex_iterator et sur chaque incrément à mesure qu'il progresse à travers les sous-correspondances demandées par les match_results actuelles, l'incrémentation du regex_iterator sous-jacente lors de l'incrémentation loin de la submatch dernière .
Original:
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.
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La valeur par défaut est construit std::regex_token_iterator l'itérateur de fin de séquence. Quand un std::regex_token_iterator valide est incrémenté après avoir atteint le dernier sous-correspondance du jeu, il devient égal à l'itérateur de fin de séquence. Déréférencement ou l'incrémentant invoque par ailleurs un comportement indéfini .
Original:
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.
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Juste avant de devenir l'itérateur de fin de séquence, une std::regex_token_iterator peut devenir un itérateur' suffixe, si l'indice -1 (non apparié fragment) apparaît dans la liste des indices submatch demandés. Un tel itérateur, si déréférencé, retourne un match_results correspondant à la séquence de caractères entre le dernier match et la fin de la séquence .
Original:
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.
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Une application typique de std::regex_token_iterator maintient le std::regex_iterator sous-jacent, un récipient (par exemple std::vector<int>) des indices de sous-correspondance demandées, le compteur interne égal à l'indice de la sous-correspondance, un pointeur vers std::match_results, montrant le sous-correspondance actuelle de la correspondance actuelle, et une std::match_results objet contenant la séquence du dernier caractère non appariée (utilisé en mode tokenizer) .
Original:
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).
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Sommaire

[modifier] Exigences de type

-
BidirIt must meet the requirements of BidirectionalIterator.

[modifier] Spécialisations

Plusieurs spécialisations pour les types courants de séquence de caractères sont définies:
Original:
Several specializations for common character sequence types are defined:
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Defined in header <regex>
Type d'
Original:
Type
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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>

[modifier] Types de membres

Type du membre Définition
value_type std::sub_match<BidirIt>
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>

[modifier] Fonctions membres

construit un nouveau regex_token_iterator
Original:
constructs a new regex_token_iterator
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(fonction membre publique)
(destructor)
(implicitement déclaré)
destructs a regex_token_iterator, including the cached value
(fonction membre publique)
remplace un regex_token_iterator
Original:
replaces a regex_token_iterator
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(fonction membre publique)
compare deux regex_token_iterators
Original:
compares two regex_token_iterators
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(fonction membre publique)
accsses submatch courant
Original:
accsses current submatch
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(fonction membre publique)
les progrès de la regex_token_iterator à la sous-correspondance suivante
Original:
advances the regex_token_iterator to the next submatch
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(fonction membre publique)

[modifier] Notes

Il est de la responsabilité du programmeur de s'assurer que l'objet std::basic_regex passé au constructeur de l'itérateur survit à l'itérateur. Parce que l'itérateur stocke une std::regex_iterator qui stocke un pointeur vers la regex, l'incrémentation de l'itérateur après les résultats de la regex a été détruit à un comportement indéfini .
Original:
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.
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[modifier] Exemple

#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"));
}

Résultat :

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