A finite automata editor, you may also express regular languages using regular grammars or expressions and then convert them to a FA.

• RegExp to DFA
• Regular grammar to NFA
• NFA to regular grammar
• FA determinization and minimization
• Union, complement and intersection of RLs (via NFAs without epsilon transitions)
• Equivalence and containment of two RLs
• Emptiness and finiteness of RLs

• Grammar non-terminals are uppercase letters (optionally followed by a ')
• Grammar terminals are lowercase letters or digits
• RegExp operators are . | ? * (e.g. a?(b|c?d)*)
• Epsilon = &