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std::match_results::prefix

Da cppreference.com
< cpp‎ | regex‎ | match results

 
 
Biblioteca de expressões regulares
Classes
Original:
Classes
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basic_regex(C++11)
sub_match(C++11)
match_results(C++11)
Algoritmos
Original:
Algorithms
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regex_match(C++11)
regex_search(C++11)
regex_replace(C++11)
Iteradores
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Iterators
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regex_iterator(C++11)
regex_token_iterator(C++11)
Exceções
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Exceptions
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regex_error(C++11)
Características
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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
Funções de membro
Original:
Member functions
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match_results::match_results
match_results::~match_results
match_results::operator=
match_results::get_allocator
Estado
Original:
State
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match_results::ready
acesso. Elemento
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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
Iteradores
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Iterators
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match_results::begin
match_results::cbegin
match_results::end
match_results::cend
Formato
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Format
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match_results::format
Modificadores
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Modifiers
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match_results::swap
 
const_reference prefix() const;
(a partir do C++ 11)

[editar] Parâmetros

(Nenhum)
Original:
(none)
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[editar] Valor de retorno

Devolve uma sub_match que representa a parte da sequência alvo, entre o início da sequência alvo e a partida de toda a expressão regular.
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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[editar] Exemplo

#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';
}

Output:

b