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5.15 rindex—reverse search for character in string

Synopsis 

     #include <string.h>
     char * rindex(const char *string, int c);

Description
This function finds the last occurence of c (converted to a char) in the string pointed to by string (including the terminating null character).

This function is identical to strrchr.
Returns
Returns a pointer to the located character, or a null pointer if c does not occur in string.
Portability
rindex requires no supporting OS subroutines.