我用这个
@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$"
regexp用于验证电子邮件
([\w\.\-]+)
-这适用于第一级域(许多字母和数字,也包括点和连字符)
([\w\-]+)
-这是针对二级域的
((\.(\w){2,3})+)
-这是用于其他级别的域(从3到无穷大),它包括一个点和2到3个文字
这个正则表达式有什么问题?
编辑:与"something@someth.ing“电子邮件不匹配
发布于 2011-08-01 09:50:06
我有一个用于检查我使用的电子邮件地址的表达式。
由于以上这些都不像我的那样简短或准确,所以我想我会把它贴在这里。
@"^[\w!#$%&'*+\-/=?\^_`{|}~]+(\.[\w!#$%&'*+\-/=?\^_`{|}~]+)*"
+ "@"
+ @"((([\-\w]+\.)+[a-zA-Z]{2,4})|(([0-9]{1,3}\.){3}[0-9]{1,3}))$";
欲了解更多信息,请在此处阅读:C# – Email Regular Expression
此外,这将基于电子邮件语法检查RFC有效性,而不是检查电子邮件是否真正存在。测试电子邮件真正存在的唯一方法是发送和发送电子邮件,并让用户通过单击链接或输入令牌来验证他们是否收到了电子邮件。
然后还有一些丢弃的域名,比如Mailinator.com等等。这不会验证电子邮件是否来自一次性域名。
发布于 2017-07-19 05:16:47
下面的代码是基于Microsoft's Data annotations implementation on github的,我认为这是对邮件最完整的验证:
public static Regex EmailValidation()
{
const string pattern = @"^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$";
const RegexOptions options = RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture;
// Set explicit regex match timeout, sufficient enough for email parsing
// Unless the global REGEX_DEFAULT_MATCH_TIMEOUT is already set
TimeSpan matchTimeout = TimeSpan.FromSeconds(2);
try
{
if (AppDomain.CurrentDomain.GetData("REGEX_DEFAULT_MATCH_TIMEOUT") == null)
{
return new Regex(pattern, options, matchTimeout);
}
}
catch
{
// Fallback on error
}
// Legacy fallback (without explicit match timeout)
return new Regex(pattern, options);
}
发布于 2012-11-08 21:40:21
这不能满足RFC 5321和5322的所有要求,但它适用于以下定义。
@"^([0-9a-zA-Z]([\+\-_\.][0-9a-zA-Z]+)*)+"@(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]*\.)+[a-zA-Z0-9]{2,17})$";
下面是代码
const String pattern =
@"^([0-9a-zA-Z]" + //Start with a digit or alphabetical
@"([\+\-_\.][0-9a-zA-Z]+)*" + // No continuous or ending +-_. chars in email
@")+" +
@"@(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]*\.)+[a-zA-Z0-9]{2,17})$";
var validEmails = new[] {
"ma@hostname.com",
"ma@hostname.comcom",
"MA@hostname.coMCom",
"m.a@hostname.co",
"m_a1a@hostname.com",
"ma-a@hostname.com",
"ma-a@hostname.com.edu",
"ma-a.aa@hostname.com.edu",
"ma.h.saraf.onemore@hostname.com.edu",
"ma12@hostname.com",
"12@hostname.com",
};
var invalidEmails = new[] {
"Abc.example.com", // No `@`
"A@b@c@example.com", // multiple `@`
"ma...ma@jjf.co", // continuous multiple dots in name
"ma@jjf.c", // only 1 char in extension
"ma@jjf..com", // continuous multiple dots in domain
"ma@@jjf.com", // continuous multiple `@`
"@majjf.com", // nothing before `@`
"ma.@jjf.com", // nothing after `.`
"ma_@jjf.com", // nothing after `_`
"ma_@jjf", // no domain extension
"ma_@jjf.", // nothing after `_` and .
"ma@jjf.", // nothing after `.`
};
foreach (var str in validEmails)
{
Console.WriteLine("{0} - {1} ", str, Regex.IsMatch(str, pattern));
}
foreach (var str in invalidEmails)
{
Console.WriteLine("{0} - {1} ", str, Regex.IsMatch(str, pattern));
}
https://stackoverflow.com/questions/5342375
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