Function memchr::memmem::rfind_iter

source · [−]

pub fn rfind_iter<'h, 'n, N: 'n + ?Sized + AsRef<[u8]>>(
    haystack: &'h [u8], 
    needle: &'n N
) -> FindRevIter<'h, 'n>ⓘNotable traits for FindRevIter<'h, 'n>impl<'h, 'n> Iterator for FindRevIter<'h, 'n>    type Item = usize;

Expand description

Returns a reverse iterator over all occurrences of a substring in a haystack.

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 foo baz foo";
let mut it = memmem::rfind_iter(haystack, b"foo");
assert_eq!(Some(16), it.next());
assert_eq!(Some(8), it.next());
assert_eq!(Some(0), it.next());
assert_eq!(None, it.next());