Method at_beginning

crates/sre_engine/src/engine.rs:1118–1121

(&self)

    }

    const fn at_beginning(&self) -> bool {
        // self.ctx().string_position == self.state().start
        self.cursor.position == 0
    }

    const fn at_end<S>(&self, req: &Request<'_, S>) -> bool {
        self.cursor.position == req.end