Method is_last

include/stringzilla/stringzilla.hpp:837–837

        bool operator!=(end_sentinel_type) const noexcept { return start_ <= end_; }
        bool operator==(end_sentinel_type) const noexcept { return start_ > end_; }
        bool is_last() const noexcept { return start_ + match_length_ == end_; }
    };

    iterator begin() const noexcept { return {string_view_type(haystack_), matcher_}; }