(.*?) regular expression

1、. Match any line break “\n” Characters outside ;
2、* Represents a match to the previous character 0 Times or infinite times ;
3、? Representing the preceding character 0 Time or 1 Secondary repetition
4、+ or * Heel ？ Greedy means no match , That is, match as little as possible , Such as *？ Repeat any number of times , But repeat as little as possible ;
5、 .*? Represents matching any number of repetitions , But use the least amount of repetition if you can make the whole match successful .
Such as ：a.*?b Match the shortest , With a Start , With b Ending string . If you apply it to aabab Words , It will match aab and ab.