blocks|key|85736|text|因此，根据您有限的描述，您似乎在寻找like+this?|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|85737|下面是模式：%5E(?<localpart>[%5E-].*[%5E-])@(?<domainpart>[%5E-].*[%5E-])\..{2,3}$|style|CODE|85738|它将它们保存到命名捕获组中，并假定localpart和domainpart都至少包含2个字符(它们应该包含)。这两个部分都不允许以-开头或结尾。|85739|还有其他要求吗?或者这几乎涵盖了它吗？|85740|entityMap|0|LINK|mutability|MUTABLE|url|https://regex101.com/r/lcm3xL/4^0|I|A|0|0|6|1O|0|1T|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@$A|Y|B|Z|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|10|8|@$A|11|B|12|F|G]]|9|@]|C|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]]]

So based on your limited description it seems like you're looking for something <a href="https://regex101.com/r/lcm3xL/4" rel="nofollow noreferrer">like this?</a>

Here is the pattern: <code>^(?&lt;localpart&gt;[^-].*[^-])@(?&lt;domainpart&gt;[^-].*[^-])\..{2,3}$</code>

It saves them into named capture groups, and it assumes that both the localpart and domainpart contain at least 2 characters (which they should). Neither parts are allowed to begin or end with <code>-</code>.

Are there any other requirements or does this pretty much cover it?

blocks|key|2606394|text|更新于2018年7月27日|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2606395|%5E(?![.!#$%25&'*%2B/=?%5E_`{%7C}~-])(?:[a-zA-Z0-9]%7C(?:(?:([.])(?!\1)%7C[!#$%25&'*%2B/=?%5E_`{%7C}~-]))(?!@)){1,64}@(?=.{1,255}$)(?!\d%2B$)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$|code-block|syntax|javascript|2606396|https://regex101.com/r/dxCmEn/1|2606397|+%5E+++++++++++++++++++++++++++++#+BOS
+(?!+[.!#$%25&'*%2B/=?%5E_`{%7C}~-]+)++#+Local+does+not+start+with+one+of+these

+(?:+++++++++++++++++++++++++++#+Local
++++++[a-zA-Z0-9]+

+++%7C++
++++++#+Special+chars
++++++#+Local+does+not+end+with+one+of+these

++++++(?:
+++++++++++#+Option+1
+++++++++++(?:
++++++++++++++++(+[.]+)+++++++++++++++++++++++#+(1),+Not+a+consecutive+special+char+(specific),+add+more
++++++++++++++++(?!+\1+)++++++++++++++++++++++#+
+++++++++++++%7C++++++++++++++++++++++++++++++#+or,
++++++++++++++++[!#$%25&'*%2B/=?%5E_`{%7C}~-]+++++++++#+One+of+these+other+special+chars,+remove+from+here
+++++++++++)

+++++++++++#+Option+2
+++++++++++#+%7C++(+[.!#$%25&'*%2B/=?%5E_`{%7C}~-]+)+++++#+(1)+Not+a+consecutive+same+special+char+
+++++++++++#++++(?!+\1+)++++++++++++++++++++++++

+++++++++++#+Option+3
+++++++++++#+%7C++[.!#$%25&'*%2B/=?%5E_`{%7C}~-]+++++++++#+Not+a+consecutive+any+special+char
+++++++++++#++++(?!+[.!#$%25&'*%2B/=?%5E_`{%7C}~-]+)++

+++++++++++#+Option+4,+Original
+++++++++++#++%7C++[.!#$%25&'*%2B/=?%5E_`{%7C}~-]++++++++#+Any+special+char+is+OK
+++++++++++#+++++

++++++)
++++++(?!+@+)

+){1,64}+++++++++++++++++++++++#+1+to+64+local+characters

+@+
+(?=+.{1,255}+$+)++++++++++++++#+1+to+255+domain+characters
+(?!+\d%2B+$+)+++++++++++++++++++#+Domain+must+not+contain+all+numbers

+[a-zA-Z0-9]+++++++++++++++++++#+Domain
+(?:
++++++[a-zA-Z0-9-]{0,61}+
++++++[a-zA-Z0-9]+
+)?
+(?:
++++++\.+
++++++[a-zA-Z0-9]+
++++++(?:
+++++++++++[a-zA-Z0-9-]{0,61}+
+++++++++++[a-zA-Z0-9]+
++++++)?
+)*
+$+++++++++++++++++++++++++++++#+EOS++++++++++|2606398|entityMap|0|LINK|mutability|MUTABLE|url^0|0|D|0|0|0|V|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|L]]]]

Updated 7/27/2018 

<pre><code>^(?![.!#$%&amp;'*+/=?^_`{|}~-])(?:[a-zA-Z0-9]|(?:(?:([.])(?!\1)|[!#$%&amp;'*+/=?^_`{|}~-]))(?!@)){1,64}@(?=.{1,255}$)(?!\d+$)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$
</code></pre>

<a href="https://regex101.com/r/dxCmEn/1" rel="nofollow noreferrer">https://regex101.com/r/dxCmEn/1</a>

<pre><code> ^ # BOS
 (?! [.!#$%&amp;'*+/=?^_`{|}~-] ) # Local does not start with one of these

 (?: # Local
 [a-zA-Z0-9] 

 | 
 # Special chars
 # Local does not end with one of these

 (?:
 # Option 1
 (?:
 ( [.] ) # (1), Not a consecutive special char (specific), add more
 (?! \1 ) # 
 | # or,
 [!#$%&amp;'*+/=?^_`{|}~-] # One of these other special chars, remove from here
 )

 # Option 2
 # | ( [.!#$%&amp;'*+/=?^_`{|}~-] ) # (1) Not a consecutive same special char 
 # (?! \1 ) 

 # Option 3
 # | [.!#$%&amp;'*+/=?^_`{|}~-] # Not a consecutive any special char
 # (?! [.!#$%&amp;'*+/=?^_`{|}~-] ) 

 # Option 4, Original
 # | [.!#$%&amp;'*+/=?^_`{|}~-] # Any special char is OK
 # 

 )
 (?! @ )

 ){1,64} # 1 to 64 local characters

 @ 
 (?= .{1,255} $ ) # 1 to 255 domain characters
 (?! \d+ $ ) # Domain must not contain all numbers

 [a-zA-Z0-9] # Domain
 (?:
 [a-zA-Z0-9-]{0,61} 
 [a-zA-Z0-9] 
 )?
 (?:
 \. 
 [a-zA-Z0-9] 
 (?:
 [a-zA-Z0-9-]{0,61} 
 [a-zA-Z0-9] 
 )?
 )*
 $ # EOS 
</code></pre>

Email format is like : local_part @ domain_part.com

<blockquote>
 <blockquote>
 Local_part &amp; domain_part should not begin or end with special characters ( @#&amp;()*,./{}&lt;>^%[]~`!$=\|;:? ) including hyphen (-)
 
 Local_part &amp; domain_part may contain above special characters like (#$%&amp;*- etc) in middle only. 
 
 Limit of lengths for local_part is 64 &amp; domain_part is 255 characters respectively.
 
 domain_part must not contain all numbers
 </blockquote>
</blockquote>

Email Regex validation in JavaScript allowing characters (#$%&* etc) in middle

电子邮件格式如下：domain_part.com @ local_part Local_part & domain_part不应以特殊字符( @#&()*，./{}<>^%[]~`!$=|;:？)开头或结尾包括连字符(-)Local_part & domain_part只能在中间包含上述特殊字符(#$%&*- etc)...

问JavaScript中的电子邮件正则表达式验证允许中间有字符(#$%&*等)
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