gExp = 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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Turner, J. C. (1985). Social categoriza-tion and the self-concept: A social-cognitive theory of group behav-ior. In E. J. Lawler (Ed.), Advances in group processes: Theory and research (Vol. 2, pp. 77-122). Greenwich, CT: JAI Press.

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