Valid email address regular expression?
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我做了一些测试，但我想问一下，是否有人看到这个用于电子邮件验证的Ruby正则表达式有问题：
1 | /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i |
看起来不错？
你很接近，只需要再加几个字符：
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(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\". \[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\[ "()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t]) *))*@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t]) +|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\ .(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z |(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*\>(?:( ?: )?[ \t])*))*)?;\s*) |
不，我不是开玩笑：http://www.ex-parrot.com/~pdw/mail-rfc822-address.html
人们总是忽略的一个有效字符是"%"。它执行内部路由方向。见电子邮件地址第17.3.3节。
请注意，这被视为遗产。然而，这表明你想要做一些非常复杂的事情。我可能只需要检查一下@字符和一个合适的域名后缀。
编辑：我忘了。现在可以获得Unicode域名，例如http://？.NET/(StAdppOfLoad的HTML编辑器对此有点混淆)
验证电子邮件地址往往比您想象的要复杂。
- 相关问题：验证电子邮件地址的最佳正则表达式是什么？
RFC 5322标准。
允许点原子本地部分、带引号的字符串本地部分、过时(混合点原子和带引号的字符串)本地部分、域名域(IPv4、IPv6和IPv4映射的IPv6地址)、域文本域和(嵌套)CFW。
1 | '/^(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){255,})(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){65,}@)((?>(?>(?>((?>(?>(?>\x0D\x0A)?[\x09 ])+|(?>[\x09 ]*\x0D\x0A)?[\x09 ]+)?)(\((?>(?2)(?>[\x01-\x08\x0B\x0C\x0E-\'*-\[\]-\x7F]|\\\[\x00-\x7F]|(?3)))*(?2)\)))+(?2))|(?2))?)([!#-\'*+\/-9=?^-~-]+|"(?>(?2)(?>[\x01-\x08\x0B\x0C\x0E-!#-\[\]-\x7F]|\\\[\x00-\x7F]))*(?2)")(?>(?1)\.(?1)(?4))*(?1)@(?!(?1)[a-z0-9-]{64,})(?1)(?>([a-z0-9](?>[a-z0-9-]*[a-z0-9])?)(?>(?1)\.(?!(?1)[a-z0-9-]{64,})(?1)(?5)){0,126}|\[(?:(?>IPv6:(?>([a-f0-9]{1,4})(?>:(?6)){7}|(?!(?:.*[a-f0-9][:\]]){8,})((?6)(?>:(?6)){0,6})?::(?7)?))|(?>(?>IPv6:(?>(?6)(?>:(?6)){5}:|(?!(?:.*[a-f0-9]:){6,})(?8)?::(?>((?6)(?>:(?6)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?9)){3}))\])(?1)$/isD' |
RFC 5321标准。
允许点原子本地部分、带引号的字符串本地部分、域名域和(IPv4、IPv6和IPv4映射的IPv6地址)域文本域。
1 | '/^(?!(?>"?(?>\\\[ -~]|[^"])"?){255,})(?!"?(?>\\\[ -~]|[^"]){65,}"?@)(?>([!#-\'*+\/-9=?^-~-]+)(?>\.(?1))*|"(?>[ !#-\[\]-~]|\\\[ -~])*")@(?!.*[^.]{64,})(?>([a-z0-9](?>[a-z0-9-]*[a-z0-9])?)(?>\.(?2)){0,126}|\[(?:(?>IPv6:(?>([a-f0-9]{1,4})(?>:(?3)){7}|(?!(?:.*[a-f0-9][:\]]){8,})((?3)(?>:(?3)){0,6})?::(?4)?))|(?>(?>IPv6:(?>(?3)(?>:(?3)){5}:|(?!(?:.*[a-f0-9]:){6,})(?5)?::(?>((?3)(?>:(?3)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?6)){3}))\])$/iD' |
基本的。
允许点原子本地部分和域名域(至少需要两个域名标签，TLD限制为2-6个字母字符)。
1 | "/^(?!.{255,})(?!.{65,}@)([!#-'*+\/-9=?^-~-]+)(?>\.(?1))*@(?!.*[^.]{64,})(?>[a-z0-9](?>[a-z0-9-]*[a-z0-9])?\.){1,126}[a-z]{2,6}$/iD" |
没关系，除非你阻止了IDN TLD:)
看看下面的链接。
比较电子邮件地址验证正则表达式
如何查找或验证电子邮件地址
在堆栈溢出时也有类似的问题。