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Answers and rating deltas for

How do I write a regex function in Python that checks if a user has only letters and numbers?

Author Votes Δ
Jim Brissom 4 +1.67
Ignacio Vazquez-Abrams 3 +0.29
Ned Batchelder 2 -1.02
Matt 0 -3.11
Last visited: Sep 14, 2014, 5:07:29 AM