the last safety net is that we can also configure a hard limit on the number of states, and you will hit that limit with an exception before running into an infinite loop. another possible safety net is to just bound the context distance: a(?=.{0,100}b) and not consider context after 100 characters.
words_in_post = set(re.findall(r'\w+', post))
，这一点在Feiyi中也有详细论述
was especially unsafe for And, and also for some Shl cases with
是否树立和践行正确政绩观，这其中衡量的标尺是什么？
Дональд Трамп. Фото: NATHAN HOWARD / Reuters