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RegToy

RegToy

This Regular Expression Toy allows you to enter a regular expression and view its translations to a NFA (Nondeterministic Finite Automaton) and a DFA (Deterministic Finite Automaton).

The examples below illustrate the supported regular experssion syntax.

a Just one character
abc Characters in sequence
ab|cd Alternatives
a* Repetition, 0 or more
b+ Repetition, 1 or more
(a|bb)* Parentheses for grouping things

(0|1)*0 Binary numbers that are multiples of two
(a|b)*aa(a|b)* Strings of a's and b's containing consecutive a's
(a|b)*ab(a|b)*
((ac|b)*|bd)a

Thomas Hallgren