Question

正则表达式\W和\w和区别

正则表达式\W代表与任何单词字符匹配和\w与任何非单词字符匹配，但是不知道单词字符与非单词字符之间的区别

Answer 1

\w :匹配包括下划线的任何单词字符,等价于 [A-Z a-z 0-9_]
\W :匹配任何非单词字符,等价于 [^A-Z a-z 0-9_]

Answer 2

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Answer 3

\w匹配：中文，日文，阿拉伯数字0到9，大写与小写字母A到Z，下划线_
\W匹配：标点符号(各种中文符号，。……英文,.?[不匹配下划线]，全角符号，❎😂❤️😭😳等等)，空格符，换行符。
.与\w的区别：
.比\w多匹配了各种标点符号，全角英文，空格符。
.加\n等于\w加\W

Answer 4

\w 取 A到Z a到z 0到9的 字符,\W 则相反