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STRRCHR(3) Library Functions Manual STRRCHR(3)

strrchr, rindex
locate last occurrence of a character in a string

#include <string.h>

char *
strrchr(const char *s, int c);

#include <strings.h>

char *
rindex(const char *s, int c);

The strrchr() function locates the last occurrence of the character c (converted to a char) in the string s. The terminating NUL character is considered part of the string. If c is ‘\0’, strrchr() locates the terminating ‘\0’.

The rindex() function is an old synonym for strrchr().

The strrchr() function returns a pointer to the located character or NULL if the character does not appear in the string.

After the following call to strrchr(), p will point to the string “obar”:
char *p;
char *s = "foobar";

p = strrchr(s, 'o');

memchr(3), strchr(3), strcspn(3), strpbrk(3), strsep(3), strspn(3), strstr(3), strtok(3), wcsrchr(3)

The strrchr() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The rindex() function is deprecated and shouldn't be used in new code.

The rindex() function first appeared in Version 7 AT&T UNIX. The strrchr() function first appeared in AT&T System III UNIX and was reimplemented for 4.3BSD-Tahoe.
October 1, 2018 OpenBSD-current