std::basic_string::rfind - cppreference.com

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`size_type rfind( const basic_string& str, size_type pos = npos ) const;`	(1)

`size_type rfind( const CharT* s, size_type pos, size_type count ) const;`	(2)

`size_type rfind( const CharT* s, size_type pos = npos ) const;`	(3)

`size_type rfind( CharT ch, size_type pos = npos ) const;`	(4)

Finds the last substring equal to the given character sequence. Search begins at pos, i.e. only the substring [0, pos) is considered in the search. If npos is passed as pos whole string will be searched.

1) Finds the last substring equal to str.

2) Finds the last substring equal to the first count characters of the character string pointed to by s. s can include null characters.

3) Finds the last substring equal to the character string pointed to by s. The length of the string is determined by the first null character.

4) Finds the last character ch.

Parâmetros

str	-	string para procurar Original: string to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	comprimento da substring a ser pesquisada Original: length of substring to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
s	-	ponteiro para uma cadeia de caracteres de pesquisa para a Original: pointer to a character string to seach for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ch	-	caracteres para pesquisa Original: character to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

posição do primeiro caractere da substring encontrado ou se não npos substring seja encontrado.

Original:

position of the first character of the found substring or npos if no such substring is found.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Exemplo

#include <string>
#include <iostream>

void print(std::string::size_type n, std::string const &s)
{
  if(n == std::string::npos)
    std::cout << "not found\n";
  else
    std::cout << "found: " << s.substr(n) << '\n';
}

int main()
{
  std::string::size_type n;
  std::string const s = "This is a string";

  // search backwards from beginning of string
  n = s.rfind("is");
  print(n, s);
  // search backwards from position 4
  n = s.rfind("is", 4);
  print(n, s);
  // find a single character
  n = s.rfind('s');
  print(n, s);
  // find a single character
  n = s.rfind('q');
  print(n, s);
}

Saída:

found: is a string
found: is is a string
found: string
not found

Veja também


find	encontrar caracteres na string Original: find characters in the string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

find_first_of	encontrar a primeira ocorrência de caracteres Original: find first occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

find_first_not_of	encontrar primeira ausência de caracteres Original: find first absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

find_last_of	encontrar última ocorrência de caracteres Original: find last occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

find_last_not_of	encontrar ausência de última caracteres Original: find last absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]