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출처 : http://lambert.tistory.com/171 EMAIL: ^[\w\-\+\&\*]+(?:\.[\w\-\+\&\*]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7}$ CREDIT CARD: ^((4\d{3})|(5[1-5]\d{2})|(6011))-?\d{4}-?\d{4}-?\d{4}|3[4,7]\d{13}$ MAC ADDRESS : ^([0-9a-fA-F][0-9a-fA-F]:){5}([0-9a-fA-F][0-9a-fA-F])$ IP ADDRESS : ^\b((25[0-5]|2[0-4]\d|[01]\d\d|\d?\d)\.){3}(25[0-5]|2[0-4]\d|[01]\d\d|\d?\d)\b$ REASONABLE DOMAIN NAME: ^([a-zA-Z0-9]([a-zA-Z0-9\..