0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"); if (!emailRegExp.test(email) || email.indexOf('.') == -1) { alert('The email address that you entered is invalid!'); return false; } return true; }

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R. J. Barro and X. Sala-I-Martin, “Convergence Across States and Regions,” Brookings Papers on Economic Activity, Vol. 1991, No. 1, 1991, pp. 107-182. doi:10.2307/2534639

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