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std::regex_iterator

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< cpp‎ | regex

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C++
 
Espressioni regolari libreria
Classi
Original:
Classes
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basic_regex(C++11)
sub_match(C++11)
match_results(C++11)
Algoritmi
Original:
Algorithms
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regex_match(C++11)
regex_search(C++11)
regex_replace(C++11)
Iteratori
Original:
Iterators
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regex_iterator(C++11)
regex_token_iterator(C++11)
Eccezioni
Original:
Exceptions
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regex_error(C++11)
Tratti
Original:
Traits
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regex_traits(C++11)
Costanti
Original:
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_iterator
 (dal C++11)
std::regex_iterator è di sola lettura ForwardIterator che accede alle singole partite di un'espressione regolare all'interno della sequenza di caratteri di base.
Original:
std::regex_iterator is a read-only ForwardIterator that accesses the individual matches of a regular expression within the underlying character sequence.
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In costruzione, e su ogni incremento, chiama std::regex_search e ricorda il risultato (che, salva una copia del std::match_results<BidirIt> valore). Il primo oggetto può essere letto quando l'iteratore è costruito o quando la dereferenziazione primo fatto. In caso contrario, dereferenziare solo restituisce una copia delle partite più recentemente ottenuto regex.
Original:
On construction, and on every increment, it calls std::regex_search and remembers the result (that is, saves a copy of the value std::match_results<BidirIt>). The first object may be read when the iterator is constructed or when the first dereferencing is done. Otherwise, dereferencing only returns a copy of the most recently obtained regex match.
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L'impostazione predefinita-costruito std::regex_iterator è la fine-di-sequenza di iteratore. Quando un std::regex_iterator valido viene incrementato dopo aver raggiunto l'ultima partita (std::regex_search ritorna false), diventa uguale alla fine-di-sequenza di iteratore. Dereferenziazione o incrementarlo richiede ulteriori comportamento indefinito.
Original:
The default-constructed std::regex_iterator is the end-of-sequence iterator. When a valid std::regex_iterator is incremented after reaching the last match (std::regex_search returns false), it becomes equal to the end-of-sequence iterator. Dereferencing or incrementing it further invokes undefined behavior.
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Una tipica implementazione di std::regex_iterator tiene il punto d'inizio e di fine per gli iteratori la sequenza sottostante (due istanze di BidirIt), un puntatore per l'espressione regolare (const regex_type*) e le bandiere (std::regex_constants::match_flag_type incontro), e la corrispondenza corrente (std::match_results<BidirIt>).
Original:
A typical implementation of std::regex_iterator holds the begin and the end iterators for the underlying sequence (two instances of BidirIt), a pointer to the regular expression (const regex_type*) and the match flags (std::regex_constants::match_flag_type), and the current match (std::match_results<BidirIt>).
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Indice

[modifica] Tipo requisiti

-
BidirIt must meet the requirements of BidirectionalIterator.

[modifica] Specializzazioni

Diverse specializzazioni per i tipi più comuni sequenze di caratteri sono definiti:
Original:
Several specializations for common character sequence types are defined:
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Definizione nell'header <regex>
Tipo
Original:
Type
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 Definition
cregex_iterator regex_iterator<const char*>
wcregex_iterator regex_iterator<const wchar_t*>
sregex_iterator regex_iterator<std::string::const_iterator>
wsregex_iterator regex_iterator<std::wstring::const_iterator>

[modifica] Membri tipi

Membro tipo
Original:
Member type
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 Definition
value_type std::match_results<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>

[modifica] Membri funzioni
costruisce un nuovo regex_iterator
Original:
constructs a new regex_iterator
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(metodo pubblico)
(destructor)
(dichiarato in modo implicito)
 destructs a regex_iterator, including the cached value
(metodo pubblico)
sostituisce un regex_iterator
Original:
replaces a regex_iterator
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(metodo pubblico)
confronta due regex_iterators
Original:
compares two regex_iterators
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(metodo pubblico)
ottiene un riferimento alla corrente match
accesses un membro della corrispondenza corrente
Original:
obtains a reference to the current match
accesses a member of the current match
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(metodo pubblico)
fa avanzare il regex_iterator al prossima partita
Original:
advances the regex_iterator to the next match
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(metodo pubblico)

[modifica] Note

E 'responsabilità del programmatore garantire che l'oggetto std::basic_regex passato al costruttore dell'iteratore sopravvive l'iteratore. Poiché l'iteratore memorizza un puntatore alla regex, incrementando l'iteratore dopo la regex è stato distrutto accede a un puntatore penzoloni.
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 pointer to the regex, incrementing the iterator after the regex was destroyed accesses a dangling pointer.
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Se la parte dell'espressione regolare che ha trovato è solo un'affermazione (^, $, \b, \B), la partita memorizzato nel iteratore è una corrispondenza di lunghezza zero, cioè, match[0].first == match[0].second.
Original:
If the part of the regular expression that matched is just an assertion (^, $, \b, \B), the match stored in the iterator is a zero-length match, that is, match[0].first == match[0].second.
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[modifica] Esempio

#include <regex>
#include <iterator>
#include <iostream>
 
int main()
{
    const std::string text = "Quick brown fox.";
 
    std::regex re("[^\\s]+");
    auto beg = std::sregex_iterator(text.begin(), text.end(), re);
    auto end = std::sregex_iterator();
 
    std::cout << "The number of words is " << std::distance(beg, end) << '\n';
}

Output: 

The number of words is 3

[modifica] Vedi anche

(C++11)
identifica una partita di espressione regolare, inclusi tutti i sub-espressione partite
Original:
identifies one regular expression match, including all sub-expression matches
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(classe template) [modifica]
(C++11)
verificare se una espressione regolare si verifica ovunque all'interno di una stringa
Original:
check if a regular expression occurs anywhere within a string
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(funzione di modello)
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/regex/regex_iterator&oldid=26662"