ruby-on-rails - Rails 正则表达式电子邮件验证，不允许使用空格

Question

我目前正在使用此代码进行电子邮件验证:

/\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i

问题是它仍然接受带有空格的电子邮件，例如 ab c@gmail.com .

我已经尝试了很多不允许空格的代码变体，但不是在表单顶部使用错误消息刷新页面，而是给了我这个错误:

The provided regular expression is using multiline anchors (^ or $), which may present a security risk. Did you mean to use \A and \z, or forgot to add the :multiline => true option?

Answer 1

您缺少开始和结束 anchor 标记，因此您可以引用此链接 Regular expressions with validations in RoR 4你正确的正则表达式将是，

/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i

您也应该尝试使用此正则表达式进行电子邮件验证，此正则表达式将满足您的所有要求并检查所有必需的可能验证。

^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$

这是对正则表达式的解释，这将有助于理解验证

^           #start of the line
  [_A-Za-z0-9-\\+]+ #  must start with string in the bracket [ ], must contains one or more (+)
  (         #   start of group #1
    \\.[_A-Za-z0-9-]+   #     follow by a dot "." and string in the bracket [ ], must contains one or more (+)
  )*            #   end of group #1, this group is optional (*)
    @           #     must contains a "@" symbol
     [A-Za-z0-9-]+      #       follow by string in the bracket [ ], must contains one or more (+)
      (         #         start of group #2 - first level TLD checking
       \\.[A-Za-z0-9]+  #           follow by a dot "." and string in the bracket [ ], must contains one or more (+)
      )*        #         end of group #2, this group is optional (*)
      (         #         start of group #3 - second level TLD checking
       \\.[A-Za-z]{2,}  #           follow by a dot "." and string in the bracket [ ], with minimum length of 2
      )         #         end of group #3
$           #end of the line

测试输出:

Email is valid : abc@yahoo.com , true
Email is valid : abc-100@yahoo.com , true
Email is valid : abc.100@yahoo.com , true
Email is valid : abc111@abc.com , true
Email is valid : abc-100@abc.net , true
Email is valid : abc.100@abc.com.au , true
Email is valid : abc@1.com , true
Email is valid : abc@gmail.com.com , true
Email is valid : abc+100@gmail.com , true
Email is valid : abc-100@yahoo-test.com , true
Email is valid : abc , false
Email is valid : abc@.com.my , false
Email is valid : abc123@gmail.a , false
Email is valid : abc123@.com , false
Email is valid : abc123@.com.com , false
Email is valid : .abc@abc.com , false
Email is valid : abc()*@gmail.com , false
Email is valid : abc@%*.com , false
Email is valid : abc..2002@gmail.com , false
Email is valid : abc.@gmail.com , false
Email is valid : abc@abc@gmail.com , false
Email is valid : ab c@gmail.com , false
Email is valid : abc@gmail.com.1a , false