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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Article citations

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Yamakita, M., Ando, D., Sato, M., Suzuki, K., & Yamagata, Z. (2017). Association between Play and Sports in Children and Non-Cognitive Skills. Sasakawa Sports Federation.
http://www.ssf.or.jp/Portals/0/resources/encourage/grant/pdf/2017/2017rs_48.pdf

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