DOT file for finite state machine diagrams.

gistfile1.txt

digraph finite_state_machine {
  rankdir=LR;

  node [shape = doublecircle]; 1;
  node [shape = circle] 0;
  node [shape = plaintext, label = ""]; start;

  start -> 0 [ label = "start"];
  0 -> 1 [ label = "[1-9]" ];
  1 -> 1 [ label = "[0-9]" ];
}