在 Ruby 中验证电子邮件地址的最佳/简单方法是什么？
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What is the best/easy way to validate an email address in Ruby?
提问by Ran
What is the best/easy way to validate an email address in ruby (on the server side)?
在 ruby 中验证电子邮件地址的最佳/简单方法是什么（在服务器端）？
回答by apneadiving
You could look whether or not it matches a regexp like the one used in this Rails validator:
您可以查看它是否与此 Rails 验证器中使用的正则表达式匹配：
validates_format_of :email,:with => /\A[^@\s]+@([^@\s]+\.)+[^@\s]+\z/
But if you use Devise, simply do:
但是，如果您使用 Devise，只需执行以下操作：
validates_format_of :email,:with => Devise::email_regexp
Source: http://lindsaar.net/2008/4/14/tip-4-detecting-a-valid-email-address
来源：http: //lindsaar.net/2008/4/14/tip-4-detecting-a-valid-email-address
Edit 1:
编辑1：
useful website for tests: http://www.rubular.com/
有用的测试网站：http: //www.rubular.com/
回答by paxdiablo
In Ruby? The same way as in any language.
在红宝石？与任何语言的方式相同。
Send a confirmation email to the address with a link that the recipient has to click before the email address is considered fully validated.
向该地址发送一封确认电子邮件，其中包含收件人必须在电子邮件地址完全验证之前单击的链接。
There are any number of reasons why a perfectly formattedaddress may still be invalid (no actual user at that address, blocked by spam filters, and so on). The only way to know for sure is a successfully completed end-to-end transaction of some description.
格式完美的地址可能仍然无效的原因有很多（该地址没有实际用户，被垃圾邮件过滤器阻止，等等）。唯一确定的方法是成功完成某种描述的端到端事务。
回答by partydog
validates :email, presence: true, format: /\w+@\w+\.{1}[a-zA-Z]{2,}/
checks that email field is not blank and that one or more characters are both preceding the '@' and following it
检查电子邮件字段是否不为空，并且在“@”之前和之后都有一个或多个字符
Added specificity, any 1 or more word characters before an the @and any 1 or more word character after and in between specifically 1 .and at least 2 letters after
增加了特殊性，the 之前的@任何 1 个或多个单词字符以及之后和之间的任何 1 个或多个单词字符，特别是.在后面的1 个和至少 2 个字母之间
回答by MZaragoza
I know that this is a old question but I was looking for a simple to way to do this. I came across a email_validator gemthis is really simple to set up and use.
我知道这是一个老问题，但我一直在寻找一种简单的方法来做到这一点。我遇到了一个email_validator gem，它的设置和使用非常简单。
as a validator
作为验证者
validates :my_email_attribute, :email => true
validates :my_email_attribute, :email => true
Validation outside a model
模型外验证
EmailValidator.valid?('[email protected]') # boolean
EmailValidator.valid?('[email protected]') # boolean
I hope that this help everyone.
我希望这对大家有帮助。
Happy Codding
快乐编码
回答by akshay
You can use
您可以使用
<%=email_field_tag 'to[]','' ,:placeholder=>"Type an email address",:pattern=>"^([\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4},*[\W]*)+$",:multiple => true%>
回答by Kanmaniselvan
You can take reference from https://apidock.com/rails/ActiveModel/Validations/HelperMethods/validates_format_of
您可以参考https://apidock.com/rails/ActiveModel/Validations/HelperMethods/validates_format_of
validates_format_of :email, with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
validates_format_of :email, with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
回答by Yurii Verbytskyi
If you are using Rails/Devise - addition to @apneadiving`s answer -
如果您使用的是 Rails/Devise - 除了@apneadiving 的答案 -
validates_format_of :email,:with => Devise::email_regexp
Devise::email_regexp is taken from config/initializers/devise.rb
Devise::email_regexp 取自 config/initializers/devise.rb
config.email_regexp = /\A[^@\s]+@([^@\s]+\.)+[^@\s]+\z/
回答by Omer Aslam
Shortcut Form:
快捷方式：
validates :email, :format => /@/
Normal Form (Regex) :
范式（正则表达式）：
validates :email, :format => { :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/ }
Source: Validator Class
来源：验证器类
回答by toobulkeh
Since the main answer's blog site was down, here is the snippet of code from that site via nice cacheror gist:
由于主要答案的博客站点已关闭，以下是通过nice cacher或gist来自该站点的代码片段：
# http://my.rails-royce.org/2010/07/21/email-validation-in-ruby-on-rails-without-regexp/
class EmailValidator < ActiveModel::EachValidator
# Domain must be present and have two or more parts.
def validate_each(record, attribute, value)
address = Mail::Address.new value
record.errors[attribute] << (options[:message] || 'is invalid') unless (address.address == value && address.domain && address.__send__(:tree).domain.dot_atom_text.elements.size > 1 rescue false)
end
end
回答by andrea
Send a confirmation mail , and I will usualy use this validator ... D.R.Y.
发送确认邮件，我通常会使用这个验证器......干
# lib/email_validator.rb
class EmailValidator < ActiveModel::EachValidator
EmailAddress = begin
qtext = '[^\x0d\x22\x5c\x80-\xff]'
dtext = '[^\x0d\x5b-\x5d\x80-\xff]'
atom = '[^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-' +
'\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+'
quoted_pair = '\x5c[\x00-\x7f]'
domain_literal = "\x5b(?:#{dtext}|#{quoted_pair})*\x5d"
quoted_string = "\x22(?:#{qtext}|#{quoted_pair})*\x22"
domain_ref = atom
sub_domain = "(?:#{domain_ref}|#{domain_literal})"
word = "(?:#{atom}|#{quoted_string})"
domain = "#{sub_domain}(?:\x2e#{sub_domain})*"
local_part = "#{word}(?:\x2e#{word})*"
addr_spec = "#{local_part}\x40#{domain}"
pattern = /\A#{addr_spec}\z/
end
def validate_each(record, attribute, value)
unless value =~ EmailAddress
record.errors[attribute] << (options[:message] || "is not valid")
end
end
end
in your model
在你的模型中
validates :email , :email => true
or
或者
validates :email, :presence => true,
:length => {:minimum => 3, :maximum => 254},
:uniqueness => true,
:email => true
