STRSTR(3) manual page
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strstr, strcasestr - locate a substring
#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);
The
strstr() function finds the first occurrence of the substring needle in
the string haystack. The terminating null bytes (aq\0aq) are not compared.
The strcasestr() function is like strstr(), but ignores the case of both
arguments.
These functions return a pointer to the beginning
of the located substring, or NULL if the substring is not found.
The strstr() function is thread-safe.
The strcasestr() function
is thread-safe with exceptions. It can be safely used in multithreaded applications,
as long as setlocale(3)
is not called to change the locale during its execution.
The strstr() function conforms to C89 and C99. The strcasestr()
function is a nonstandard extension.
index(3)
, memchr(3)
,
memmem(3)
, rindex(3)
, strcasecmp(3)
, strchr(3)
, string(3)
, strpbrk(3)
,
strsep(3)
, strspn(3)
, strtok(3)
, wcsstr(3)
This page is part of
release 3.78 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 http://www.kernel.org/doc/man-pages/.
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