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



NAME
       strstr - locate a substring

SYNOPSIS
       #include <string.h>

       char *strstr(const char *haystack, const char *needle);

       #define _GNU_SOURCE

       #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 `\0' characters 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.

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 correctly, and
       return haystack when needle is empty.

CONFORMING TO
       The strstr() function conforms to ISO 9899.  The strcasestr() function  is  a
       non-standard extension.

SEE ALSO
       index(3),   memchr(3),   rindex(3),   strchr(3),  strcasecmp(3),  strpbrk(3),
       strsep(3), strspn(3), strtok(3)



GNU                                  2005-04-05                            STRSTR(3)
(END)                                                                                     

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