Method is_empty_match

regex/src/input.rs:121–123

(&self, at: InputAt, empty: &InstEmptyLook)

    fn previous_char(&self, at: InputAt) -> Char { (**self).previous_char(at) }

    fn is_empty_match(&self, at: InputAt, empty: &InstEmptyLook) -> bool {
        (**self).is_empty_match(at, empty)
    }

    fn prefix_at(
        &self,