Reuse mode is controlled by -r --reusable option. 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 being 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 */.