Regular expression for valid email address?
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完全重复：使用正则表达式验证电子邮件地址
什么是有效的电子邮件地址字符和模式，以及如何编写与之匹配的正则表达式？
干得好：
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不，我不是开玩笑。网址：http://www.ex-parrot.com/~pdw/mail-rfc822-address.html
这里是一个很好的起点：
网址：http://www.regular-expressions.info/email.html
作为补充说明，该网站可能是开始正则表达式帮助和教程的最佳位置。
简短的回答是：这很复杂。
我在电子邮件验证中遇到的最完整和最准确的regex就是这里记录的那个。它不是为心脏微弱，它是复杂的，它被分成了部分，使人们更容易解析(样本代码是在Java)。但是，如果一路通过验证是值得的，我认为它不会变得更好。
请记住，规范提到了许多可能不被视为电子邮件地址典型的情况。您可能希望了解这些情况，并决定这些情况对您是否重要。
无论如何，我建议您使用单元测试来确认您的表达式涵盖了您认为重要的情况。这样，当你到处闲逛的时候，你可以确定你没有打破一些以前有效的案例。