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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../string/byte/strrchr.html below:

std::strrchr - cppreference.com

const char* strrchr( const char* str, int ch );

      char* strrchr(       char* str, int ch );

Finds the last occurrence of ch (after conversion to char) in the byte string pointed to by str. The terminating null character is considered to be a part of the string and can be found if searching for '\0'.

[edit] Parameters str - pointer to the null-terminated byte string to be analyzed ch - character to search for [edit] Return value

Pointer to the found character in str, or null pointer if no such character is found.

[edit] Example 
#include <cstring>
#include <iostream>
 
int main()
{
    char input[] = "/home/user/hello.c";
    char* output = std::strrchr(input, '/');
    if (output)
        std::cout << output + 1 << '\n';
}

Output:

[edit] See also finds the first occurrence of a character
(function) [edit] finds the last occurrence of a wide character in a wide string
(function) [edit] find the last occurrence of a substring
(public member function of std::basic_string<CharT,Traits,Allocator>) [edit]

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