; } var emailRegExp = new RegExp("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[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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M. Sales-Pardo, R. Guimerá, A. Moreira, A. Moreira and L. A. N. Amaral, “Extracting the Hierarchical Organization of Complex Systems,” Proceedings of the National Academy of Sciences, Vol. 104, No. 39, 2007, pp. 15224-15229. doi:10.1073/pnas.0703740104

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