High Quality Content by WIKIPEDIA articles! Ragel is a finite-state machine compiler with output support for C, C++, C#, Objective-C, D, Java, Go and Ruby source code. It supports the generation of table or control flow driven state machines from regular expressions and/or state charts and can also build lexical analysers via the longest-match method. A unique feature of Ragel is that user actions can be associated with arbitrary state machine transitions using operators that are integrated into the regular expressions. Ragel also supports visualization of the generated machine via graphviz.