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GNU
April 12, 1993
Aliases: strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3), strcasestr(3)

manpages-pt-dev

Portuguese Versions of the Manual Pages (dev sections)

manpages-dev

Manual pages about using GNU/Linux for development

man-pages

Linux kernel and C library user-space interface documentation

NAME

strstr - locate a substring

SYNOPSIS

#include <string.h>

char *strstr(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.

RETURN VALUE

The strstr() function returns 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 argument. Later versions (like 4.6.27) work correctly, and return haystack when needle is empty.
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