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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
STRSTR(3) Linux Programmer's Manual STRSTR(3)
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 ('\0') 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.
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 │
└─────────────┴───────────────┴────────────────┘
strstr(): POSIX.1-2001, POSIX.1-2008, C89, 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 4.12 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/.
GNU 2015-08-08 STRSTR(3)
Pages that refer to this page: index(3), memchr(3), memmem(3), strchr(3), string(3), strpbrk(3), strsep(3), strspn(3), strtok(3), wcsstr(3), signal-safety(7)