共同点(?:pattern) 与 (?=pattern)都匹配pattern,但不会把pattern结果放到Matches的集合中。区别对字符串:"industry abc"的匹配结果:industr(?:y|ies) ---> "industry"industr(?=y|ies) ---> "industr"是否消耗字符出处:https://www.jianshu.com/p/43af3e83e6e9