std::strrchr (3) - Linux Man Pages
Defined in header <cstring>
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'.
str - pointer to the null-terminated byte string to be analyzed
ch - character to search for
Pointer to the found character in str, or null pointer if no such character is found.
// Run this code
rfind (public member function of std::basic_string<CharT,Traits,Allocator>)