c# - .Net regex: what is the word character w?

Question

Simple question:
What is the pattern for the word character w in c#, .net?

My first thought was that it matches [A-Za-z0-9_] and the documentation tells me:

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

which is not very helpful.
And w seems to match ??ü, too. What else? Is there a better (exact) definition available?

Answer 1

From the 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].

See also

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