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.
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内梅西奥·塞万提斯身亡后，哈利斯科州及其邻近州随即爆发多起骚乱事件。据墨西哥安全部通报，报复袭击已造成27名安全人员丧生。墨西哥总统辛鲍姆23日表示，当前政府的核心目标是保障安全与和平，为今年6月世界杯的顺利举办筑牢安全基础。，这一点在同城约会中也有详细论述
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