正则表达式中[[]]与`.`之间的区别 [英] Differences between`[.]` vs `.` in regex

问题描述

以下表达式不相同:/[.] */和/.*/.为什么会这样，它们到底有什么不同? [] 和正则表达式中的特殊字符之间有什么相互作用?

The following expressions are not the same: /[.]*/ and /.*/. Why is that, and how exactly are they different? What is the interaction between the [] and special characters in regular expressions?

谢谢.

推荐答案

点.通常是通配符，匹配任何字符.但是，在字符类( [] )中，它被视为文字，并且仅与点匹配.

The dot . is normally a wildcard, matching any character. Within a character class (the []) however, it is treated as a literal and only matches a dot.

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