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STRSTR(3)                  Linux Programmer's Manual                 STRSTR(3)

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 nee-
       dle 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 substring,  or
       NULL if the substring is not found.
CONFORMING TO
       The  strstr() function conforms to C89 and C99.  The strcasestr() func-
       tion is a nonstandard extension.
BUGS
       Early versions of Linux libc (like 4.5.26) would  not  allow  an  empty
       needle  argument  for strstr().  Later versions (like 4.6.27) work cor-
       rectly, and return haystack when needle is empty.
SEE ALSO
       index(3), memchr(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 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU                               2011-09-28                         STRSTR(3)