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    std::regex_constants::syntax_option_type

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    <metanoindex/>

     
    C++
     
    Regular expressions bibliothque
    Classes
    Original:
    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 itrateurs
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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)
     
    <tbody> </tbody>
    Dclar dans l'en-tte <regex>
    typedef /*unspecified*/ syntax_option_type; static constexpr syntax_option_type icase = /*unspecified*/; static constexpr syntax_option_type nosubs = /*unspecified*/; static constexpr syntax_option_type optimize = /*unspecified*/; static constexpr syntax_option_type collate = /*unspecified*/; static constexpr syntax_option_type ECMAScript = /*unspecified*/; static constexpr syntax_option_type basic = /*unspecified*/; static constexpr syntax_option_type extended = /*unspecified*/; static constexpr syntax_option_type awk = /*unspecified*/; static constexpr syntax_option_type grep = /*unspecified*/; static constexpr syntax_option_type egrep = /*unspecified*/;
    Le syntax_option_type est un BitmaskType qui contient des options qui rgissent la faon dont se comportent les expressions rgulires .
    Original:
    The syntax_option_type is a BitmaskType that contains options that govern how regular expressions behave.
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    Les valeurs possibles pour ce type (icase, optimize, etc) sont doubles l'intrieur std :: basic_regex .
    Original:
    The possible values for this type (icase, optimize, etc.) are duplicated inside std :: basic_regex.
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    Constantes

    Valeur
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    Value
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    		 Effect(s)
    icase
    Correspondance caractres doit tre effectue sans respecter la casse .
    Original:
    Character matching should be performed without regard to case.
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    nosubs
    Lors de l'excution matchs, pas de matchs sous-expression doit tre stock dans la structure std::regex_match fourni .
    Original:
    When performing matches, no sub-expression matches should be stored in the supplied std::regex_match structure.
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    optimize
    Charge le moteur d'expressions rgulires faire correspondre plus rapidement, avec le cot potentiel de faire de la construction plus lente. Par exemple, cela pourrait signifier la conversion d'un FSA non-dterministe une dterministe FSA .
    Original:
    Instructs the regular expression engine to make matching faster, with the potential cost of making construction slower. For example, this might mean converting a non-deterministic FSA to a deterministic FSA.
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    collate
    Les plages de caractres de la forme "[ab]" sera sensible locale .
    Original:
    Character ranges of the form "[a-b]" will be locale sensitive.
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    ECMAScript
    Utilisez le code ECMAScript (JavaScript) grammaire expression rgulire (ECMA-262 grammar documentation), modifi pour supporter des lments d'assemblage, les classes de personnages, et des classes d'quivalence de POSIX, et les alias de classes de caractres \d, \D, \s, \S, \w et \W sont fabriqus locale-sensibles
    Original:
    Use the ECMAScript (JavaScript) regular expression grammar (ECMA-262 grammar documentation), modified to support collating elements, character classes, and equivalence classes from POSIX, and the character class aliases \d, \D, \s, \S, \w, and \W are made locale-sensitive
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    basic
    Utilisez la grammaire de base des expressions rgulires POSIX (grammar documentation) .
    Original:
    Use the basic POSIX regular expression grammar (grammar documentation).
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    extended
    Utilisez la grammaire prolonge expression rationnelle POSIX (grammar documentation) .
    Original:
    Use the extended POSIX regular expression grammar (grammar documentation).
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    awk
    Utilisez la grammaire expression rgulire utilise par l'utilitaire awk' dans POSIX (grammar documentation)
    Original:
    Use the regular expression grammar used by the awk utility in POSIX (grammar documentation)
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    grep
    Utilisez la grammaire expression rgulire utilise par l'utilitaire grep' dans POSIX. C'est effectivement la mme que l'option basic avec l'ajout du saut de ligne '\ n' comme un sparateur d'alternance .
    Original:
    Use the regular expression grammar used by the grep utility in POSIX. This is effectively the same as the basic option with the addition of newline '\n' as an alternation separator.
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    egrep
    Utilisez la grammaire expression rgulire utilise par l'utilitaire grep', avec l'option-E, dans POSIX. C'est effectivement la mme que l'option extended avec l'ajout du saut de ligne '\ n' comme un sparateur d'alternance dans addtion | '.
    Original:
    Use the regular expression grammar used by the grep utility, with the -E option, in POSIX. This is effectively the same as the extended option with the addition of newline '\n' as an alternation separator in addtion to '|'.
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    Notes

    Parce que POSIX utilise "le plus long le plus gauche" rgle de correspondance (la sous-squence la plus longue correspondance est trouve, et si il ya plusieurs squences telles, le premier est appari), il n'est pas appropri, par exemple, pour analyser les langages de balisage: une regex POSIX comme "<tag[^>]*>.*</tag>" correspondrait tout, de la premire la "<tag" "</tag>" dernire, y compris tous les "</tag>" et "<tag>" entre les deux. D'autre part, prend en charge ECMAScript non gourmandes matchs, et la spcification ECMAScript regex "<tag[^>]*>.*?</tag>" correspondrait seulement jusqu' la premire balise fermante .
    Original:
    Because POSIX uses "leftmost longest" matching rule (the longest matching subsequence is matched, and if there are several such subsequences, the first one is matched), it is not suitable, for example, for parsing markup languages: a POSIX regex such as "<tag[^>]*>.*</tag>" would match everything from the first "<tag" to the last "</tag>", including every "</tag>" and "<tag>" inbetween. On the other hand, ECMAScript supports non-greedy matches, and the ECMAScript regex "<tag[^>]*>.*?</tag>" would match only until the first closing tag.
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    Exemple

    Illustre la diffrence de l'algorithme d'appariement entre ECMAScript et les expressions rationnelles POSIX
    Original:
    Illustrates the difference in the matching algorithm between ECMAScript and POSIX regular expressions
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    #include <iostream>
#include <string>
#include <regex>

int main()
{
    std::string str = "zzxayyzz";
    std::regex re1(".*(a|xayy)"); // ECMA
    std::regex re2(".*(a|xayy)", std::regex::extended); // POSIX

    std::cout << "Searching for .*(a|xayy) in zzxayyzz:\n";
    std::smatch m;
    std::regex_search(str, m, re1);
    std::cout << " ECMA (depth first search) match: " << m[0] << '\n';
    std::regex_search(str, m, re2);
    std::cout << " POSIX (leftmost longest)  match: " << m[0] << '\n';
}

    Rsultat : 

    Searching for .*(a|xayy) in zzxayyzz:
 ECMA (depth first search) match: zzxa
 POSIX (leftmost longest)  match: zzxayy

    Voir aussi

    (C++11)
    objet expression rgulire
    Original:
    regular expression object
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    (classe gnrique) [edit]
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