Reuse mode is controlled by the -r --reusable option. This allows reuse of scanner definitions with /*!use:re2c */ after /*!rules:re2c */. In this mode, no /*!re2c */ block and exactly one /*!rules:re2c */ must be present. The rules are saved and used by every /*!use:re2c */ block that follows. These blocks can contain inplace configurations, especially re2c:flags:e, re2c:flags:w, re2c:flags:x, re2c:flags:u and re2c:flags:8. That way, it is possible to create the same scanner multiple times for different character types, different input mechanisms, or different output mechanisms. The /*!use:re2c */ blocks can also contain additional rules that will be appended to the set of rules in /*!rules:re2c */.