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std::match_results::prefix

De cppreference.com
< cpp‎ | regex‎ | match results

 
 
Regular expressions bibliothèque
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 itérateurs
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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)
 
std::match_results
Les fonctions membres
Original:
Member functions
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match_results::match_results
match_results::~match_results
match_results::operator=
match_results::get_allocator
État
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State
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match_results::ready
Elément d'accès
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Element access
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match_results::size
match_results::max_size
match_results::empty
match_results::length
match_results::position
match_results::str
match_results::operator_at
match_results::prefix
match_results::suffix
Les itérateurs
Original:
Iterators
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match_results::begin
match_results::cbegin
match_results::end
match_results::cend
Format
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Format
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match_results::format
Modificateurs
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Modifiers
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match_results::swap
 
const_reference prefix() const;
(depuis C++11)

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

Retourne un sub_match représentant la partie de la séquence cible, entre le début de la séquence cible et l'intégralité du match de l'expression régulière .
Original:
Returns a sub_match representing the part of the target sequence between the beginning of the target sequence and the entire match of the regular expression.
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[modifier] Exemple

#include <iostream>
#include <regex>
#include <string>
 
int main()
{
  std::regex re("a(a)*b");
  std::string target("baaaby");
  std::smatch sm;
 
  std::regex_search(target, sm, re);
  std::cout << sm.prefix().str() << '\n';
}

Résultat :

b