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Showing content from https://cplusplus.com/reference/string/string/find_last_not_of/ below:

public member function

std::string::find_last_not_of string (1)

size_t find_last_not_of (const string& str, size_t pos = npos) const;

c-string (2)

size_t find_last_not_of (const char* s, size_t pos = npos) const;

buffer (3)

size_t find_last_not_of (const char* s, size_t pos, size_t n) const;

character (4)

size_t find_last_not_of (char c, size_t pos = npos) const;

string (1)

size_t find_last_not_of (const string& str, size_t pos = npos) const noexcept;

c-string (2)

size_t find_last_not_of (const char* s, size_t pos = npos) const;

buffer (3)

size_t find_last_not_of (const char* s, size_t pos, size_t n) const;

character (4)

size_t find_last_not_of (char c, size_t pos = npos) const noexcept;

Find non-matching character in string from the end

Searches the string for the last character that does not match any of the characters specified in its arguments.

When pos is specified, the search only includes characters at or before position pos, ignoring any possible occurrences after pos.

Parameters

str: Another string with the set of characters to be used in the search.
pos: Position of the last character in the string to be considered in the search.
Any value greater than, or equal to, the string length (including string::npos) means that the entire string is searched.
Note: The first character is denoted by a value of 0 (not 1).
s: Pointer to an array of characters.
If argument n is specified (3), the first n characters in the array are used in the search.
Otherwise (2), a null-terminated sequence is expected: the length of the sequence with the characters used in the search is determined by the first occurrence of a null character.
n: Number of character values to search for.
c: Individual character to be searched for.

size_t is an unsigned integral type (the same as member type string::size_type).

Return Value The position of the first character that does not match.
If no such characters are found, the function returns string::npos.

size_t is an unsigned integral type (the same as member type string::size_type).

Example

// string::find_last_not_of
#include <iostream>       // std::cout
#include <string>         // std::string
#include <cstddef>        // std::size_t

int main ()
{
  std::string str ("Please, erase trailing white-spaces   \n");
  std::string whitespaces (" \t\f\v\n\r");

  std::size_t found = str.find_last_not_of(whitespaces);
  if (found!=std::string::npos)
    str.erase(found+1);
  else
    str.clear();            // str is all whitespace

  std::cout << '[' << str << "]\n";

  return 0;
}

[Please, erase trailing white-spaces]

Complexity Unspecified, but generally up to linear in the string length (or pos) times the number of characters to match (worst case).

Iterator validity No changes.

Data races The object is accessed.

Exception safety If s does not point to an array long enough, it causes undefined behavior.
Otherwise, the function never throws exceptions (no-throw guarantee).

See also

string::find: Find content in string (public member function)

string::find_last_of: Find character in string from the end (public member function)

string::find_first_not_of: Find absence of character in string (public member function)

string::replace: Replace portion of string (public member function)

string::substr: Generate substring (public member function)

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