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Home/ Questions/Q 848403
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T06:56:12+00:00 2026-05-15T06:56:12+00:00

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

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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 äöü, too. What else? Is there a better (exact) definition available?

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  1. Editorial Team
    Editorial Team
    2026-05-15T06:56:13+00:00Added an answer on May 15, 2026 at 6:56 am

    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
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