std::string::find_last_not_of in C++
Last Updated :
04 Feb, 2021
It searches the string for the first character, from the end of the string, that does not match any of the characters specified in its arguments.
Return value : Index of first unmatched character when successful or string::npos if no such character found.
Syntax 1: Search for the last character that is not an element of the string str.
size_type string::find_last_not_of (const string& str) const
str : Another string with the set of characters
to be used in the search.
CPP
#include <iostream>
using namespace std;
void find_last_not_ofDemo(string str)
{
string::size_type ch = str.find_last_not_of('G');
cout << "First unmatched character : ";
cout << str[ch];
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
find_last_not_ofDemo(str);
return 0;
}
|
Output:
Original String : Hello World!
String to be looked in : GeeksforGeeks
First unmatched character : !
Syntax 2: Search for the last character from index idx that is not an element of the string str.
size_type string::find_last_not_of (const string& str, size_type idx) const
str : Another string with the set of characters
to be used in the search.
idx : is the index number from where we have to
start finding first unmatched character.
CPP
#include <iostream>
using namespace std;
void find_last_not_ofDemo(string str)
{
string::size_type ch = str.find_last_not_of('G', 6);
cout << "First unmatched character : ";
cout << str[ch];
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
find_last_not_ofDemo(str);
return 0;
}
|
Output:
Original String : geeKsforgeeks
String to be looked in : GeeksforGeeks
First unmatched character : K
Syntax 3: Searches for the last character that is or is not also an element of the C-string cstr.
size_type string::find_last_not_of (const char* cstr) const
cstr : Another C-string with the set of characters
to be used in the search.
Note that cstr may not be a null pointer (NULL).
CPP
#include <iostream>
using namespace std;
void find_last_not_ofDemo(string str)
{
string::size_type ch = str.find_last_not_of("svmnist", 4, 3);
cout << "First unmatched character : ";
cout << str[ch];
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
find_last_not_ofDemo(str);
return 0;
}
|
Output:
Original String : GeeksforGeeks
First unmatched character : G
Syntax 4: Search for the last character from index idx that is not an element of the C-string cstr
size_type string::find_last_not_of (const string& str, size_type idx) const
cstr : Another C-string with the set of characters
to be used in the search.
idx : is the index number from where we have to
start finding first unmatched character.
Note that cstr may not be a null pointer (NULL).
Output:
Original String : GeeksforGeeks
First unmatched character : f
Syntax 5: Finds last character in str which is not equal to char c.
size_type string::find_last_not_of (const char* cstr) const
c: Character c with which contents of str are required to be compared.
CPP
#include <iostream>
using namespace std;
void find_last_not_ofDemo(string str)
{
string::size_type ch = str.find_last_not_of('G');
cout << "First unmatched character : ";
cout << str[ch];
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
find_last_not_ofDemo(str);
return 0;
}
|
Output:
Original String : GeeksforGeeks
First unmatched character : s
Syntax 6: Finds last character in str from index idx which is not equal to char c.
size_type string::find_last_not_of (const char* cstr, size_type idx) const
c: Character c with which contents of str are required to be compared.
idx : index from where search of the first
unmatched character is to be started
CPP
#include <iostream>
using namespace std;
void find_last_not_ofDemo(string str)
{
string::size_type ch = str.find_last_not_of('G', 6);
cout << "First unmatched character : ";
cout << str[ch];
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
find_last_not_ofDemo(str);
return 0;
}
|
Output:
Original String : GeeksforGeeks
First unmatched character : o
Syntax 7: Search for the last character that is also not an element of the chars_len characters of the character array chars, starting at index idx.
size_type string::find_last_not_of (const char* chars, size_type idx, size_type
chars_len) const
*chars : is the character array with which
searching of first unmatched is to be performed.
idx : index number in string
chars_len : is the character length in
*chars to be picked for searching purpose
CPP
#include <iostream>
using namespace std;
void find_last_not_ofDemo(string str)
{
string::size_type ch = str.find_last_not_of("svmnist", 4, 3);
cout << "First unmatched character : ";
cout << str[ch];
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
find_last_not_ofDemo(str);
return 0;
}
|
Output:
Original String : GeeksforGeeks
First unmatched character : k
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