pub fn build_reverse<'n, B: ?Sized + AsRef<[u8]>>(
        &self,
        needle: &'n B,
    ) -> FinderRev<'n> {
        let needle = needle.as_ref();
        FinderRev {
            needle: CowBytes::new(needle),
            searcher: SearcherRev::new(needle),
        }
    }
Build a reverse finder using the given needle from the current
settings.
src/memmem/mod.rs