Each character in a regular expression of length m has only one corresponding state in the corresponding NFA. The initial state of NFA is 0, which contains a (virtual) acceptance state m. Every state corresponding to a character in the alphabet has an edge pointing to it, which points to the state corresponding to the next character in the pattern. The states corresponding to metacharacters "(",")" | "and" * "contain at least one indication edge (red edge). Some states have multiple indicator edges, but a state can only have one indicator black edge.

((A_B_AC)D)((A*B|AC)D)((A_B_AC)D) corresponds to NFA (all modes are agreed to be enclosed in brackets).

National Futures Association (NFA), a non-commercial independent institution engaged in futures and foreign exchange trading in the United States. The National Futures Association (NFA) is a self-regulatory organization of the futures industry established in a certain year according to the provisions of Section I of the American Commodity Exchange Act, and it is a non-profit membership organization. A passage in the Commodity Trading Law originated from the third chapter of the Commodity Futures Trading Commission (CFTC) Law of a certain year, which stipulated the registration of futures associations and CFTC's supervision of futures professional self-regulatory associations. On a certain day of a certain year, CFTC accepted NFA as a "registered futures association", and on a certain day of a certain year, NFA officially started to operate.