std::basic_string::rfind

From cppreference.com


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.

#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	find characters in the string (public member function)

find_first_of	find first occurrence of characters (public member function)

find_first_not_of	find first absence of characters (public member function)

find_last_of	find last occurrence of characters (public member function)

find_last_not_of	find last absence of characters (public member function)

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)

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

std::basic_string::rfind

Contents

[edit] Parameters

[edit] Return value

[edit] Example

[edit] See also