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    std::regex_iterator

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    C++
     
    Reguläre Ausdrücke Bibliothek
    Classes
    Original:
    Classes
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    basic_regex(C++11)
    sub_match(C++11)
    match_results(C++11)
    Algorithmen
    Original:
    Algorithms
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    regex_match(C++11)
    regex_search(C++11)
    regex_replace(C++11)
    Iteratoren
    Original:
    Iterators
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    regex_iterator(C++11)
    regex_token_iterator(C++11)
    Ausnahmen
    Original:
    Exceptions
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    regex_error(C++11)
    Traits
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    Traits
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    regex_traits(C++11)
    Konstanten
    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 =typenamestd::iterator_traits<BidirIt>::value_type,
        class Traits =std::regex_traits<CharT>

    >class regex_iterator
    		(seit C++11)
    std::regex_iterator ist ein Nur-Lese-ForwardIterator, die die einzelnen Spiele eines regulären Ausdrucks greift innerhalb der zugrunde liegenden Zeichenfolge .
    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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    Auf dem Bau, und auf jedem Inkrement, ruft es std::regex_search und erinnert sich das Ergebnis (das heißt, speichert eine Kopie des Wertes std::match_results<BidirIt>). Der erste Gegenstand kann gelesen werden, wenn der Iterator konstruiert oder wenn die erste Dereferenzierung abgenommen werden kann. Ansonsten Dereferenzierung gibt nur eine Kopie des zuletzt erhaltenen 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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    Die default-konstruiert std::regex_iterator ist die End-of-sequence Iterator. Wenn eine gültige std::regex_iterator nach Erreichen des letzten Spiels (std::regex_search kehrt false) erhöht wird, wird es gleich dem End-of-sequence Iterator. Dereferenzierung oder Inkrementieren es weiter aufruft undefinierten Verhalten .
    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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    Eine typische Implementierung std::regex_iterator hält die Anfang und Ende Iteratoren für die zugrunde liegende Sequenz (zwei Instanzen von BidirIt), ein Zeiger auf den regulären Ausdruck (const regex_type*) und den Match-Flags (std::regex_constants::match_flag_type) und der aktuellen match (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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    Inhaltsverzeichnis

    [Bearbeiten]Type Anforderungen

    -
    BidirIt must meet the requirements of BidirectionalIterator.

    [Bearbeiten]Spezialisierungen

    Mehrere Spezialisierungen für gemeinsame Zeichenfolge Typen sind definiert:
    Original:
    Several specializations for common character sequence types are defined:
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    definiert in Header <regex>
    Type
    Original:
    Type
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    		 Definition
    cregex_iteratorregex_iterator<constchar*>
    wcregex_iteratorregex_iterator<constwchar_t*>
    sregex_iteratorregex_iterator<std::string::const_iterator>
    wsregex_iteratorregex_iterator<std::wstring::const_iterator>

    [Bearbeiten]Mitglied Typen

    Mitglied Typ
    Original:
    Member type
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    		 Definition
    value_typestd::match_results<BidirIt>
    difference_typestd::ptrdiff_t
    pointerconst value_type*
    referenceconst value_type&
    iterator_categorystd::forward_iterator_tag
    regex_typebasic_regex<CharT, Traits>

    [Bearbeiten]Member-Funktionen

    baut eine neue regex_iterator
    Original:
    constructs a new regex_iterator
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    (öffentliche Elementfunktion)
    (destructor)
    (implizit deklariert)
    		 destructs a regex_iterator, including the cached value
    (öffentliche Elementfunktion)
    ersetzt eine regex_iterator
    Original:
    replaces a regex_iterator
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    (öffentliche Elementfunktion)
    vergleicht zwei regex_iterators
    Original:
    compares two regex_iterators
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    (öffentliche Elementfunktion)
    Ruft einen Verweis auf die aktuelle match
    accesses ein Mitglied der aktuellen Match
    Original:
    obtains a reference to the current match
    accesses a member of the current match
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    (öffentliche Elementfunktion)
    Fortschritte der regex_iterator zum nächsten Treffer
    Original:
    advances the regex_iterator to the next match
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    (öffentliche Elementfunktion)

    [Bearbeiten]Notes

    Es ist der Programmierer dafür verantwortlich, sicherzustellen, dass die std::basic_regex übergebene Objekt des Iterators Konstruktor den Iterator überlebt. Da der Iterator speichert einen Zeiger auf die regex, Inkrementieren der Iterator nach der regex wurde zerstört greift auf eine dangling Pointer .
    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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    Wenn das Teil des regulären Ausdrucks, die abgestimmt ist nur eine Behauptung (^, $, \b, \B), ist das Spiel in der Iterator gespeichert eine Null-Länge übereinstimmen, dh 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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    [Bearbeiten]Beispiel

    #include <regex>#include <iterator>#include <iostream>   int main(){conststd::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

    [Bearbeiten]Siehe auch

    (C++11)
    identifiziert einen regulären Ausdruck, inkl. aller Unterseiten Ausdruck übereinstimmt
    Original:
    identifies one regular expression match, including all sub-expression matches
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    (Klassen-Template)[edit]
    (C++11)
    prüfen, ob ein regulärer Ausdruck tritt überall in einem String
    Original:
    check if a regular expression occurs anywhere within a string
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    (Funktions-Template)
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/regex/regex_iterator&oldid=27790“
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