std::basic_string::substr

From cppreference.com


basic_string substr( size_type pos = 0, size_type count = npos );

Returns a substring [pos, pos+count). If the requested substring extends past the end of the string, or if count == npos, the returned substring is [pos, size()).

#include <string>
#include <iostream>
 
int main()
{
    std::string a = "0123456789abcdefghij";
 
    std::string sub1 = a.substr(10);
    std::cout << sub1 << '\n';
 
    std::string sub2 = a.substr(5, 3);
    std::cout << sub2 << '\n';
 
    std::string sub3 = a.substr(12, 100);
    std::cout << sub3 << '\n';
 
    std::string sub4 = a.substr(a.size()-3, 50);
    std::cout << sub4 << '\n';
}

Output:

abcdefghij
567
cdefghij
hij

[edit] See also


copy	copies characters (public member function)

size length	returns the number 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)

std::basic_string::substr

Contents

[edit] Parameters

[edit] Return value

[edit] Exceptions

[edit] Complexity

[edit] Example

[edit] See also

pos	-	position of the first character to include
count	-	length of the substring