std::regex_token_iterator
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| template< class BidirIt, |
(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).The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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).The text has been machine-translated via Google Translate.
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Sommaire |
[modifier] Exigences de type
-BidirIt must meet the requirements of BidirectionalIterator.
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[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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
cregex_token_iterator
|
regex_token_iterator<const char*> |
wcregex_token_iterator
|
regex_token_iterator<const wchar_t*> |
sregex_token_iterator
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regex_token_iterator<std::string::const_iterator> |
wsregex_token_iterator
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regex_token_iterator<std::wstring::const_iterator> |
[modifier] Types de membres
| Type du membre | Définition |
value_type
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std::sub_match<BidirIt> |
difference_type
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std::ptrdiff_t |
pointer
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const value_type* |
reference
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const value_type& |
iterator_category
|
std::forward_iterator_tag |
regex_type
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basic_regex<CharT, Traits> |
[modifier] Fonctions membres
| construit un nouveau regex_token_iterator Original: constructs a new regex_token_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
| (destructeur) (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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
| compare deux regex_token_iterators Original: compares two regex_token_iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
| accsses submatch courant Original: accsses current submatch The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (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
