c# - .Net 正则表达式 : what is the word character\w?

Question

简单的问题:
c#、.net 中单词字符 \w 的模式是什么？

我的第一个想法是它匹配 [A-Za-z0-9_] 和 documentation告诉我:

Character class    Description          Pattern     Matches\w                 Matches any          \w          "I", "D", "A", "1", "3"                   word character.                  in "ID A1.3"

这不是很有帮助。
\w 似乎也匹配 äöü。还有什么？是否有更好(准确)的定义可用？

Answer 1

来自documentation :

Word Character: \w

\w matches any word character. A word character is a member of any of the Unicode categories listed in the following table.

• Ll (Letter, Lowercase)
• Lu (Letter, Uppercase)
• Lt (Letter, Titlecase)
• Lo (Letter, Other)
• Lm (Letter, Modifier)
• Nd (Number, Decimal Digit)
• Pc (Punctuation, Connector)
  • This category includes ten characters, the most commonly used of which is the LOWLINE character (_), u+005F.

If ECMAScript-compliant behavior is specified, \w is equivalent to [a-zA-Z_0-9].

另见

• Unicode Character Database
• Unicode Characters in the 'Punctuation, Connector' Category