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A comment on Divisibility by 7 is a Walk on a Graph (2009). Parent comment

Re:Divisibility by 7 is a Walk on a Graph (2009) by robryk on Monday November 09, 2015 @03:42AM (#10531940)
> It also seems that regexes can't express accepting expressions like AB where A is accepted by itself (considering AB is accepted), which in the DFA is implemented by sending it to the initial state

B* does that.

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