Method index

regex/src/re_bytes.rs:1013–1016

(&self, i: usize)

    type Output = [u8];

    fn index(&self, i: usize) -> &[u8] {
        self.get(i).map(|m| m.as_bytes())
            .unwrap_or_else(|| panic!("no group at index '{}'", i))
    }
}

/// Get a group by name.