index - Man Page

locate character in string

Library

Standard C library (libc, -lc)

Synopsis

#include <strings.h>

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

Description

The index() function returns a pointer to the first occurrence of the character c in the string s.

The rindex() function returns a pointer to the last occurrence of the character c in the string s.

The terminating null byte ('\0') is considered to be a part of the strings.

Return Value

The index() and rindex() functions return a pointer to the matched character or NULL if the character is not found.

Attributes

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue
index(), rindex()Thread safetyMT-Safe

Standards

4.3BSD; marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specifications of index() and rindex(), recommending strchr(3) and strrchr(3) instead.

See Also

memchr(3), strchr(3), string(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3)

Referenced By

memchr(3), strchr(3), string(3), strpbrk(3), strsep(3), strspn(3), strstr(3), strtok(3).

The man page rindex(3) is an alias of index(3).

2022-10-09 Linux man-pages 6.01