Namespace
Varianti

std::regex_match

Da cppreference.com.
< cpp‎ | regex

 
 
Espressioni regolari libreria
Classi
Original:
Classes
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basic_regex(C++11)
sub_match(C++11)
match_results(C++11)
Algoritmi
Original:
Algorithms
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regex_match(C++11)
regex_search(C++11)
regex_replace(C++11)
Iteratori
Original:
Iterators
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regex_iterator(C++11)
regex_token_iterator(C++11)
Eccezioni
Original:
Exceptions
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regex_error(C++11)
Tratti
Original:
Traits
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regex_traits(C++11)
Costanti
Original:
Constants
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syntax_option_type(C++11)
match_flag_type(C++11)
error_type(C++11)
 
Defined in header <regex>
template< class BidirIt,

          class Alloc, class CharT, class Traits >
bool regex_match( BidirIt first, BidirIt last,
                  std::match_results<BidirIt,Alloc>& m,
                  const std::basic_regex<CharT,Traits>& e,
                  std::regex_constants::match_flag_type flags =

                      std::regex_constants::match_default );
(1) (dal C++11)
template< class BidirIt,

          class CharT, class Traits >
bool regex_match( BidirIt first, BidirIt last,
                  const std::basic_regex<CharT,Traits>& e,
                  std::regex_constants::match_flag_type flags =

                      std::regex_constants::match_default );
(2) (dal C++11)
template< class CharT, class Alloc, class Traits >

bool regex_match( const CharT* str,
                  std::match_results<const CharT*,Alloc>& m,
                  const std::basic_regex<CharT,Traits>& e,
                  std::regex_constants::match_flag_type flags =

                      std::regex_constants::match_default );
(3) (dal C++11)
template< class STraits, class SAlloc,

          class Alloc, class CharT, class Traits >
bool regex_match( const std::basic_string<CharT,STraits,SAlloc>& s,
                  std::match_results<
                      typename std::basic_string<CharT,STraits,SAlloc>::const_iterator,
                      Alloc
                  >& m,
                  const std::basic_regex<CharT,Traits>& e,
                  std::regex_constants::match_flag_type flags =

                      std::regex_constants::match_default );
(4) (dal C++11)
template< class CharT, class Traits >

bool regex_match( const CharT* str,
                  const std::basic_regex<CharT,Traits>& e,
                  std::regex_constants::match_flag_type flags =

                      std::regex_constants::match_default );
(5) (dal C++11)
template< class STraits, class SAlloc,

          class CharT, class Traits >
bool regex_match( const std::basic_string<CharT, STraits, SAlloc>& s,
                  const std::basic_regex<CharT,Traits>& e,
                  std::regex_constants::match_flag_type flags =

                      std::regex_constants::match_default );
(6) (dal C++11)
1)
Determina se esiste una corrispondenza tra la e espressione regolare e l'intera sequenza di caratteri di destinazione [first,last), tenendo conto degli effetti di flags. I risultati delle partite vengono restituiti in m.
Original:
Determines if there is a match between the regular expression e and the entire target character sequence [first,last), taking into account the effect of flags. Match results are returned in m.
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2)
Si comporta come (1) di cui sopra, omettendo i risultati delle partite.
Original:
Behaves as (1) above, omitting the match results.
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3)
Restituisce std::regex_match(str, str + std::char_traits<charT>::length(str), m, e, flags).
Original:
Returns std::regex_match(str, str + std::char_traits<charT>::length(str), m, e, flags).
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4)
Restituisce std::regex_match(s.begin(), s.end(), m, e, flags).
Original:
Returns std::regex_match(s.begin(), s.end(), m, e, flags).
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5)
Restituisce std::regex_match(str, str + std::char_traits<charT>::length(str), e, flags).
Original:
Returns std::regex_match(str, str + std::char_traits<charT>::length(str), e, flags).
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6)
Restituisce std::regex_match(s.begin(), s.end(), e, flags).
Original:
Returns std::regex_match(s.begin(), s.end(), e, flags).
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Indice

[modifica] Parametri

first, last -
l'intervallo di caratteri di destinazione per applicare la regex per, dato come iteratori
Original:
the target character range to apply the regex to, given as iterators
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m -
i risultati delle partite
Original:
the match results
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str -
stringa di destinazione, data come terminazione null di tipo C stringa
Original:
the target string, given as a null-terminated C-style string
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s -
stringa di destinazione, dato come std::basic_string
Original:
the target string, given as a std::basic_string
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e -
l'espressione regolare
Original:
the regular expression
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flags -
flag usato per determinare come la partita verrà eseguita
Original:
flags used to determine how the match will be performed
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Type requirements
-
BidirIt must meet the requirements of BidirectionalIterator.

[modifica] Valore di ritorno

Restituisce true se esiste una corrispondenza, false altrimenti. In entrambi i casi, l'oggetto viene aggiornato m, come segue:
Original:
Returns true if a match exists, false otherwise. In either case, the object m is updated, as follows:
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Se la partita non esiste:
Original:
If the match does not exist:
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m.ready() == true
m.empty() == true
m.size() == 0
Se la partita esiste:
Original:
If the match exists:
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m.ready() true
m.empty() false
m.size()
numero di sottoespressioni più 1, cioè, 1+e.mark_count()
Original:
number of subexpressions plus 1, that is, 1+e.mark_count()
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m.prefix().first first
m.prefix().second first
m.prefix().matched
false (il prefisso partita è vuota)
Original:
false (the match prefix is empty)
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m.suffix().first last
m.suffix().second last
m.suffix().matched
false (il suffisso partita è vuota)
Original:
false (the match suffix is empty)
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m[0].first first
m[0].second last
m[0].matched
true (l'intera sequenza corrisponde)
Original:
true (the entire sequence is matched)
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m[n].first
l'inizio della sequenza che ha trovato sottoespressione n, o last se la sottoespressione non ha partecipato alla partita
Original:
the start of the sequence that matched sub-expression n, or last if the subexpression did not participate in the match
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m[n].second
la fine della sequenza che ha trovato sottoespressione n, o last se la sottoespressione non ha partecipato alla partita
Original:
the end of the sequence that matched sub-expression n, or last if the subexpression did not participate in the match
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m[n].matched
true se sottoespressione n partecipato alla partita, false altrimenti
Original:
true if sub-expression n participated in the match, false otherwise
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[modifica] Esempio

#include <iostream>
#include <string>
#include <regex>
 
int main()
{
    std::string fnames[] = {"foo.txt", "bar.txt", "zoidberg"};
 
    std::regex txt_regex("[a-z]+\\.txt");
    for (const auto &fname : fnames) {
        std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n';
    }
}

Output:

foo.txt: 1
bar.txt: 1
zoidberg: 0

[modifica] Vedi anche

Espressione oggetto regolare
Original:
regular expression object
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(classe template) [edit]
identifica una partita di espressione regolare, inclusi tutti i sub-espressione partite
Original:
identifies one regular expression match, including all sub-expression matches
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(classe template) [edit]