pub fn find(haystack: &[u8], needle: &[u8]) -> Option<usize>Expand description
Returns the index of the first occurrence of the given needle.
Note that if you’re are searching for the same needle in many different
small haystacks, it may be faster to initialize a Finder once,
and reuse it for each search.
Complexity
This routine is guaranteed to have worst case linear time complexity
with respect to both the needle and the haystack. That is, this runs
in O(needle.len() + haystack.len()) time.
This routine is also guaranteed to have worst case constant space complexity.
Examples
Basic usage:
use memchr::memmem;
let haystack = b"foo bar baz";
assert_eq!(Some(0), memmem::find(haystack, b"foo"));
assert_eq!(Some(4), memmem::find(haystack, b"bar"));
assert_eq!(None, memmem::find(haystack, b"quux"));