Allow from_regex(..., alphabet=...)
to exclude branches; add alphabet=
to from_lark()
#3839
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Closes #3808, which will be useful downstream - although I expect the
from_regex()
change to be useful to more people.This doesn't do anything about #1804; I tried grabbing a few complex grammars to test against but they made for very very slow tests. After hitting my timebox, I decided that it would be better to ship what I have here and leave further work for another day.