blocks|key|722505|text|这是一个我已经使用了一段时间的电子邮件正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|722506|\b[A-Z0-9._%25%2B-]%2B@[A-Z0-9.-]%2B\.[A-Z]{2,4}\b|code-block|syntax|javascript|722507|这是来自here的|offset|length|722508|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regular-expressions.info/email.html^0|0|0|4|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Here's an email regex that I've been using for a while:

<pre><code>\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b
</code></pre>

It's from <a href="http://www.regular-expressions.info/email.html" rel="nofollow">here</a>

blocks|key|4391272|text|/\b[A-Z0-9._%25a-z\-]%2B@(?:[A-Z0-9a-z\-]%2B\.)%2B[A-Za-z]{2,4}\z/|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4391273|这是我用来验证电子邮件的。|unstyled|4391274|来源：http://www.regular-expressions.info/email.html|offset|length|4391275|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regular-expressions.info/email.html^0|0|0|3|1A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|F|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<pre><code>/\b[A-Z0-9._%a-z\-]+@(?:[A-Z0-9a-z\-]+\.)+[A-Za-z]{2,4}\z/
</code></pre>

This is what I use to validate email.

Source: <a href="http://www.regular-expressions.info/email.html" rel="noreferrer">http://www.regular-expressions.info/email.html</a>

blocks|key|2789675|text|validates_format_of+:email,+
++:with+=>+/%5E(%7C(([A-Za-z0-9]%2B_%2B)%7C([A-Za-z0-9]%2B\-%2B)%7C([A-Za-z0-9]%2B\.%2B)%7C([A-Za-z0-9]%2B\%2B%2B))*[A-Za-z0-9]%2B@((\w%2B\-%2B)%7C(\w%2B\.))*\w{1,63}\.[a-zA-Z]{2,6})$/i|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2789676|别让我解释它！这是来自一个验证插件，我后来忘记了，因为我需要的只是电子邮件正则表达式。|unstyled|2789677|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>validates_format_of :email, 
 :with =&gt; /^(|(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6})$/i
</code></pre>

Don't ask me to explain it! That was from a validation plugin that I've since lost track of as all I needed was the email regex.

blocks|key|2789701|text|我对此的看法(参见上面的评论和链接)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2789702|%5E.%2B@.%2B$|code-block|syntax|javascript|2789703|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

My shot at this (see comment and link above):

<pre><code>^.+@.+$
</code></pre>

blocks|key|4391450|text|对于电子邮件验证，我提出了这个正则表达式，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4391451|/%5E[\w\d]%2B@[\w\d]%2B(\.[\w\d]%2B)%2B$/|code-block|syntax|javascript|4391452|不知道这会对你有多大帮助，但对我来说很好。|4391453|如果任何人发现它失败的任何电子邮件地址，请回复我，所以我将能够在此工作更多。|4391454|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For email validation, I come up with this regular expression,

<pre><code>/^[\w\d]+@[\w\d]+(\.[\w\d]+)+$/
</code></pre>

Don't know how much it will help you but working fine for me.

If anyone find it failing for any email address please reply me so I will be able to work more on this.

blocks|key|722713|text|validates_format_of+:email,+:with+=>+/\A[A-Za-z0-9._%25%2B-]%2B@[A-Za-z0-9.-]%2B\.[A-Za-z]%2B\z/i|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|722714|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>validates_format_of :email, :with =&gt; /\A[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]+\z/i
</code></pre>

blocks|key|2789763|text|这是我们使用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2789764|我们假设它是“某物”@“某物”。"something“，2-4个字符。它应该涵盖任何“常规”电子邮件。|2789765|/%5E([a-zA-Z0-9_\-\.]%2B)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)%7C(([a-zA-Z0-9\-]%2B\.)%2B))([a-zA-Z]{2,4}%7C[0-9]{1,3})(\]?)$/|code-block|syntax|javascript|2789766|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here's what we use.

We assume it's "something" @ "something" . "something" (2-4 characters). It should cover any "regular" email.

<pre><code>/^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/
</code></pre>

blocks|key|722841|text|@jensgram的答案真的很好，但它实际上仍然允许没有域名的电子邮件，例如foo@bar和foo@bar.com一样有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|722842|下面是它的一个需要string@string.string的微小变化：|722843|/\A\S%2B@.%2B\.\S%2B\z/|offset|length|style|CODE|722844|或者，可读性更好(尽管不需要括号)：|722845|/\A(\S%2B)@(.%2B)\.(\S%2B)\z/|722846|722847|*注意:这种正则表达式比许多更复杂的正则表达式更好，因为允许电子邮件具有令人难以置信的多样性。从技术上讲，如果用引号括起来，电子邮件甚至可以使用空格，例如“这是一个有效的电子邮件”@email.com|722848|*编辑:我已经用\A和\z替换了%5E和$，以防止在rails测试中出现多行锚点错误。|722849|*编辑:感谢@Barry注意到regex允许空白。已使用\S更新正则表达式，以防止包含不正确空格的电子邮件。由于email@foo.bar.com是可接受的地址，因此仍允许使用多个点。|722850|entityMap^0|0|0|0|H|0|0|0|N|0|0|0|8|2|B|2|G|1|I|1|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@$F|Z|G|10|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|12|8|@$F|13|G|14|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|17|8|@$F|18|G|19|H|I]|$F|1A|G|1B|H|I]|$F|1C|G|1D|H|I]|$F|1E|G|1F|H|I]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|V|$]]

@jensgram's answer is really good, but it actually still allows for an email without a domain, e.g. foo@bar is as valid as foo@bar.com.

Here's a slight variation on it that requires string@string.string:

<code>/\A\S+@.+\.\S+\z/</code>

or, more readable (though the parentheses aren't needed):

<code>/\A(\S+)@(.+)\.(\S+)\z/</code>

<a href="http://rubular.com/?regex=%5CA%5CS%2B%40.%2B%5C.%5CS%2B%5Cz&amp;test=foo@bar.com">Play around with this</a>

*Note: this regex is better than many, more complex ones, because of how incredibly diverse an email is allowed to be. Technically, an email can even use spaces if wrapped in quotes, e.g. "This is a valid email"@email.com

*Edit: I've replaced the <code>^</code> and <code>$</code> with <code>\A</code> and <code>\z</code> to prevent a multiline anchor error in rails testing.

*Edit: Thanks to @Barry for noticing that the regex allowed white spaces. Updated the regex with \S to prevent emails with improper whitespaces. Multiple dots are still allowed as email@foo.bar.com is an acceptable address.

blocks|key|722905|text|用法：/\A[%5E@\s]%2B@[%5E@\s]%2B\z/|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|722906|722907|它断言在本地部分和域中都没有@符号或空格，并且有一个@符号分隔本地部分和域。|blockquote|722908|722909|722910|更重要的是：需要电子邮件验证|BOLD|722911|随着更多的tlds被创建，这是前瞻性的思考。|722912|这来自Devise，这是一种用于身份验证的行业标准。|722913|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/plataformatec/devise/blob/master/lib/devise.rb#L113^0|3|L|0|0|0|0|0|6|8|0|0|3|6|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|13|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|14|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|15|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|17|8|@$9|18|A|19|B|N]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1A|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|S|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

use: <code>/\A[^@\s]+@[^@\s]+\z/</code>

<blockquote>
 It asserts that there are no @ symbols or whitespaces in either the localpart or the domain, and that there is a single @ symbol separating the localpart and the domain.
</blockquote>

More importantly: require email verification 

As more tlds are being created, this is forward thinking.

This is from <a href="https://github.com/plataformatec/devise/blob/master/lib/devise.rb#L113" rel="nofollow noreferrer">Devise</a>
, an industry standard for authentication.

blocks|key|2789922|text|这些其他答案中的大多数都过于严格，或者允许使用明显错误的地址。因此，最好放弃过于严格，这会让用户感到沮丧，只做正确的主要事情。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2789923|1.最常见的用例：|offset|length|style|BOLD|2789924|++++validates+:email,+...,+format:+{+with:+/\A[%5E@\s]%2B@([%5E@.\s]%2B\.)%2B[%5E@.\s]%2B\z/+}|code-block|syntax|javascript|2789925|要同时允许root@localhost+homer@blinky**，或，请使用以下命令：**|CODE|2789926|++++validates+:email,+...,+format:+{+with:+/\A[%5E@\s]%2B@([%5E@.\s]%2B\.)*[%5E@.\s]%2B\z/+}|2789927|以上都不能代替查找验证码、dns记录、DNS域黑名单、IP黑名单和确认电子邮件。|2789928|对于真实的电子邮件域验证，可以使用以下代码：https://gist.github.com/9200104|2789929|这匹马现在被打得精疲力竭，正被打成谷仓。|2789930|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/9200104^0|0|0|9|0|0|5|E|K|E|10|B|5|E|K|C|0|0|0|14|0|0|1H|M|V|0|0|0|K|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|19|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1A|8|@$D|1B|E|1C|F|G]|$D|1D|E|1E|F|G]|$D|1F|E|1G|F|G]|$D|1H|E|1I|F|O]|$D|1J|E|1K|F|O]]|9|@]|A|$]]|$1|P|3|Q|5|J|7|1L|8|@]|9|@]|A|$K|L]]|$1|R|3|S|5|6|7|1M|8|@$D|1N|E|1O|F|G]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1P|8|@$D|1Q|E|1R|F|G]]|9|@$D|1S|E|1T|1|1U]]|A|$]]|$1|V|3|W|5|6|7|1V|8|@$D|1W|E|1X|F|G]]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]]|Y|$Z|$5|10|11|12|A|$13|14]]]]

Most of these other answers are too restrictive or allow addresses that are clearly wrong. So it's better to give up on being too strict, which will frustrate users and just get the main things right. 

1. The most common use-case:

<pre class="lang-rb prettyprint-override"><code> validates :email, ..., format: { with: /\A[^@\s]+@([^@.\s]+\.)+[^@.\s]+\z/ }
</code></pre>

2. To also allow <code>root@localhost</code> or <code>homer@blinky</code>, use this:

<pre class="lang-rb prettyprint-override"><code> validates :email, ..., format: { with: /\A[^@\s]+@([^@.\s]+\.)*[^@.\s]+\z/ }
</code></pre>

None of the above replaces looking for CAPTCHAs, dns records, dns domain blacklists, IP blacklists and confirmation emails.

For real email domain validation, this can be used instead: <a href="https://gist.github.com/9200104" rel="noreferrer">https://gist.github.com/9200104</a>

This horse is thoroughly beaten now, and being made into kibble.

blocks|key|1710415|text|在非英语区域设置中，您可能需要验证带有重音(unicode)字符的电子邮件，如čšēīū等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1710416|此方法在以下区域设置中检查返回的nil，作为电子邮件验证失败的标志：|offset|length|style|CODE|1710417|def+validate_unicode_email+email
++/\A[\w\u00C0-\u017F\-]%2B(\.[\w\u00C0-\u017F\-]%2B)?@[\w\u00C0-\u017F\-]%2B\.[\w]{2,6}$/.match+email
end|code-block|syntax|javascript|1710418|这将传递像name.surname@gmail.com，āpsis@mājās.lv，test_email@test_domain.org这样的电子邮件|1710419|entityMap^0|0|G|3|0|0|5|M|S|E|17|Q|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|P|$]]

In non-English locales you may need to verify emails with accented (unicode) characters such as čšēīū etc.

This method checks for a returned <code>nil</code> as a sign for a failed email validation in such locales:

<pre><code>def validate_unicode_email email
 /\A[\w\u00C0-\u017F\-]+(\.[\w\u00C0-\u017F\-]+)?@[\w\u00C0-\u017F\-]+\.[\w]{2,6}$/.match email
end
</code></pre>

This will pass emails like <code>name.surname@gmail.com</code>, <code>āpsis@mājās.lv</code>, <code>test_email@test_domain.org</code>

blocks|key|723003|text|%5E.%2B@[\w]%2B\S[%5E\s]%2B$|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|723004|对第一个答案的简短改进|723005|entityMap^0|0|I|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

<code>^.+@[\w]+\S[^\s]+$</code>

A short improvement to first answer

blocks|key|1714231|text|没有足够的声誉来添加评论，但如果您要使用Devise+regexp，并且您已经在使用Devise本身，那么您可以简单地使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1714232|validates+:email,+presence:+true,+format:+Devise.email_regexp|offset|length|style|CODE|1714233|entityMap^0|0|0|1P|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Not enough reputation to add a comment but if you are going to use the Devise regexp, and you are already using Devise itself, then you can simply use:

<code>validates :email, presence: true, format: Devise.email_regexp</code>

blocks|key|4391843|text|URI模块具有内置的regexp|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4391844|URI::MailTo::EMAIL_REGEXP|code-block|syntax|javascript|4391845|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

URI module has a build-in regexp
<pre class="lang-rb prettyprint-override"><code>URI::MailTo::EMAIL_REGEXP
</code></pre>

blocks|key|2790104|text|正确的格式:+email@domain.com|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2790105|规则：|2790106|域名没有whitespace|2790107|character前缀%2B@%2B%2B。%2B字符后缀|unordered-list-item|2790108|2790109|答案很简单：|2790110|def+validate_email(email)
++(email+=~+%25r{%5E\S%2B@\S%2B\.\S%2B$}xi).present?
end|code-block|syntax|javascript|2790111|示例：|2790112|'email'+#+false+(no+'@'+and+no+domain)
'email@'+#+false+(no+domain)
'email@domain'+#+false+(domain+format+without+'.')
'em+ail@d+omain.com'+#+false+(whitespace+included)
'@domain.com'+#+false+(no+character+prefix)
'email@domain.'+#+false+(no+character+suffix)
'email@domain.com'+#+true|2790113|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|12|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|14|8|@]|9|@]|A|$O|P]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

correct format: email@domain.com
rules:
<ul>
<li>no whitespace</li>
<li>character prefix + @ + domain + . + character suffix</li>
</ul>
simple answer:
<pre><code>def validate_email(email)
 (email =~ %r{^\S+@\S+\.\S+$}xi).present?
end
</code></pre>
examples:
<pre><code>'email' # false (no '@' and no domain)
'email@' # false (no domain)
'email@domain' # false (domain format without '.')
'em ail@d omain.com' # false (whitespace included)
'@domain.com' # false (no character prefix)
'email@domain.' # false (no character suffix)
'email@domain.com' # true
</code></pre>

I'm looking for a regex to validate an email to learn if it's valid or not.. I have the following:

<pre><code>def is_a_valid_email?(email)
 email_regex = %r{
 ^ # Start of string
 [0-9a-z] # First character
 [0-9a-z.+]+ # Middle characters
 [0-9a-z] # Last character
 @ # Separating @ character
 [0-9a-z] # Domain name begin
 [0-9a-z.-]+ # Domain name middle
 [0-9a-z] # Domain name end
 $ # End of string
 }xi # Case insensitive

 (email =~ email_regex)
end
</code></pre>

Problem with the above is <code>XXX_XXX@Xxx.com</code> does not return as valid when it should be. Any thoughts or suggestions for a better regex?

Thanks

rails - REGEX for email validation

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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我正在寻找一个正则表达式来验证电子邮件，以了解它是否有效。我有以下几点：def is_a_valid_email?(email)    email_regex = %r{      ^ # Start of string      [0-9a-z] # First character      [0-9a-z.+]+ ...

问rails -用于电子邮件验证的REGEX
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