std::basic_string::rfind

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std::basic_string
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basic_string::basic_string
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(C++11)
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(C++11)
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(C++11)
basic_string::rend
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(C++11)
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basic_string::substr
basic_string::copy
basic_string::resize
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Search
basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Constants
basic_string::npos
Non-member functions
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Helper classes
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(C++11)
 
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.

Contents

[edit] Parameters

str - string to search for
count - length of substring to search for
s - pointer to a character string to seach for
ch - character to search for

[edit] Return value

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

[edit] Example

#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);
}

Output:

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

[edit] See also

find characters in the string
(public member function)
find first occurrence of characters
(public member function)
find first absence of characters
(public member function)
find last occurrence of characters
(public member function)
find last absence of characters
(public member function)