Support multiple accept states with $

[olehmisar]

Migrated from olehmisar#8

As reported, for "alexa?$" regex, these strings should pass but they fail:

alexaaaalex
alexalex
alexaalex

From @ewynx:

The issue seems to be the combination of $ and multiple accepting states. I think the problem here might be that the occurrence of $ is not incorporated into the DFA itself as a state with its transitions, but as a bool that is read separately.