> Matches letters, digits and underscores. Equivalent to [A-Za-z0-9_].

I suppose that is a good enough definition.

according to the docs:

> Match a word character. Word characters are 
> [\p{Alphabetic}\p{Mark}\p{Decimal_Number}\p{Connector_Punctuation}\u200c\u200d].

http://userguide.icu-project.org/strings/regexp


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