Philip's idea seems pretty good:
^\w+
That says: look for any string that starts with one or more "word"
characters (letters, numbers, underscores).
Try it out in rubular:
http://rubular.com/
It let's you quickly experiment with lots of regular expressions and
has a quick-ref right there on the page.

On Feb 11, 11:58 am, Rodrigo Alves Vieira <rodrig...@gmail.com> wrote:
> Underscore is allowed.

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