STRSTR
Section: Linux Programmer's Manual (3)
Updated: 2019-03-06
Page Index
NAME
strstr, strcasestr - locate a substring
SYNOPSIS
#include <string.h>
char *strstr(const char *haystack, const char *needle);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
char *strcasestr(const char *haystack, const char *needle);
DESCRIPTION
The
strstr()
function finds the first occurrence of the substring
needle
in the string
haystack.
The terminating null bytes ('\0') are not compared.
The
strcasestr()
function is like
strstr(),
but ignores the case of both arguments.
RETURN VALUE
These functions return a pointer to the beginning of the
located substring, or NULL if the substring is not found.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strstr()
| Thread safety | MT-Safe
|
|
strcasestr()
| Thread safety | MT-Safe locale
|
CONFORMING TO
strstr():
POSIX.1-2001, POSIX.1-2008, C89, C99.
The
strcasestr()
function is a nonstandard extension.
SEE ALSO
index(3),
memchr(3),
memmem(3),
rindex(3),
strcasecmp(3),
strchr(3),
string(3),
strpbrk(3),
strsep(3),
strspn(3),
strtok(3),
wcsstr(3)
COLOPHON
This page is part of release 5.10 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.