help make it faster please

[Fredrik Lundh]

Lonnie Princehouse wrote:

> "[a-z0-9_]" means "match a single character from the set {a through z,
> 0 through 9, underscore}".

"\w" should be a bit faster; it's equivalent to "[a-zA-Z0-9_]" (unless you
specify otherwise using the locale or unicode flags), but is handled more
efficiently by the RE engine.

(you can use \w in sets too, so you can do e.g. "[\w@]")

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