Query: strcasestr
OS: centos
Section: 3
Links: centos man pages all man pages
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STRSTR(3) Linux Programmer's Manual STRSTR(3)NAMEstrstr, strcasestr - locate a substringSYNOPSIS#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);DESCRIPTIONThe strstr() function finds the first occurrence of the substring needle in the string haystack. The terminating null bytes (' ') are not compared. The strcasestr() function is like strstr(), but ignores the case of both arguments.RETURN VALUEThese functions return a pointer to the beginning of the substring, or NULL if the substring is not found.CONFORMING TOThe strstr() function conforms to C89 and C99. The strcasestr() function is a nonstandard extension.BUGSEarly 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 ALSOindex(3), memchr(3), rindex(3), strcasecmp(3), strchr(3), string(3), strpbrk(3), strsep(3), strspn(3), strtok(3), wcsstr(3)COLOPHONThis 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/.GNU2011-09-28 STRSTR(3)