re2c: re2c re2c: re2c: re2c is a tool for writing very fast and very flexible scanners. re2c: Unlike any other such tool, re2c focuses on generating high re2c: efficient code for regular expression matching. As a result this re2c: allows a much broader range of use than any traditional lexer re2c: offers. re2c: re2c: re2c: re2c: