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std::regex_iterator

提供: cppreference.com
< cpp‎ | regex

 
 
正規表現ライブラリ
クラス
Original:
Classes
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basic_regex(C++11)
sub_match(C++11)
match_results(C++11)
アルゴリズム
Original:
Algorithms
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regex_match(C++11)
regex_search(C++11)
regex_replace(C++11)
イテレータ
Original:
Iterators
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regex_iterator(C++11)
regex_token_iterator(C++11)
例外
Original:
Exceptions
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regex_error(C++11)
形質
Original:
Traits
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regex_traits(C++11)
定数
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
(C++11およびそれ以降)
std::regex_iterator基礎となる文字シーケンス内の正規表現の個人戦にアクセスする読み取り専用ForwardIteratorです.
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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建設上の、すべての増分で、それはstd::regex_search呼び出し、結果を(つまり、値std::match_results<BidirIt>のコピーを保存します)覚えています。イテレータが構築されるか、最初の逆参照が行われたときの最初のオブジェクトを読み取ることができます。それ以外の場合、間接参照すると、最も最近得られた正規表現マッチのコピーを返します。.
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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デフォルト構築std::regex_iteratorエンドオブシーケンスイテレータです。有効なstd::regex_iteratorが最後に試合を(std::regex_search戻りfalse)に達した後にインクリメントされると、エンド·オブ·シーケンスイテレータと等しくなる。さらにそれを間接参照またはインクリメントすると、未定義の動作を呼び出す.
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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std::regex_iteratorの典型的な実装が始まり、基礎となるシーケンス(BidirItの2つのインスタンス)、正規表現(const regex_type*)とマッチフラグ(std::regex_constants::match_flag_type)へのポインタ、および現在のマッチ(std::match_results<BidirIt>)の終了イテレータを保持している.
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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目次

[編集] 型の要件

-
BidirIt must meet the requirements of BidirectionalIterator.

[編集] スペシャ

一般的な文字のシーケンス型にはいくつかの特殊化が定義されています
Original:
Several specializations for common character sequence types are defined:
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Defined in header <regex>
タイプ
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>

[編集] メンバータイプ

メンバー·タイプ
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>

[編集] メンバ関数

が新しいregex_iteratorを構築します
Original:
constructs a new regex_iterator
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(パブリックメンバ関数)
(destructor)
(暗黙的に宣言された)
destructs a regex_iterator, including the cached value
(パブリックメンバ関数)
として知られている、より精巧なソリューションを提供します。 regex_iteratorを置き換えます
Original:
replaces a regex_iterator
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(パブリックメンバ関数)
2 regex_iteratorsを比較します
Original:
compares two regex_iterators
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(パブリックメンバ関数)
現在への言及は、現在のマッチのメンバーをmatch
accesses取得します
Original:
obtains a reference to the current match
accesses a member of the current match
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(パブリックメンバ関数)
次の試合に進みregex_iterator
Original:
advances the regex_iterator to the next match
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(パブリックメンバ関数)

[編集] ノート

これは、イテレータのコンストラクタに渡されたstd::basic_regexオブジェクトがイテレータを長生きことを保証するためには、プログラマの責任です。反復子は、正規表現が破壊された後にイテレータをインクリメントする、正規表現へのポインタを格納するため、ダングリングポインタにアクセスし.
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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マッチした正規表現の一部がちょうどアサーション(^$\b\B)の場合、反復子に格納されている試合は長さゼロのマッチ、match[0].first == match[0].secondです.
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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[編集]

#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

[編集] も参照してください

すべてのサブ表現の一致を含む一つの正規表現が一致した場合には、識別されます
Original:
identifies one regular expression match, including all sub-expression matches
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(クラステンプレート) [edit]
正規表現は、文字列内の任意の場所に発生するかどうかを確認します
Original:
check if a regular expression occurs anywhere within a string
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(関数テンプレート)