^(?=.{1,64}@)[A-Za-z0-9_-]+(\.…

^(?=.{1,64}@)[A-Za-z0-9_-]+(\.[A-Za-z0-9_-]+)*@[^-][A-Za-z0-9-]+(\.[A-Za-z0-9-]+)*(\.[A-Za-z]{2,})$

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