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正则1:/^\w{3,}(.\w+)*@[A-z0-9]+(.[A-z]{2,5}){1,2}$/
正则2: /^([A-Za-z0-9_-.\u4e00-\u9fa5])+@([A-Za-z0-9_-.])+.([A-Za-z]{2,8})$/
正则1不够全面,例如[email protected]正常格式邮箱会不通过,故替换成第二条正则