我用这个
@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$"
Regexp来验证电子邮件
([\w\.\-]+) -用于第一级域名(许多字母和数字，也有点和连字符) ([\w\-]+) -用于二级域 ((\.(\w){2,3})+) -这是用于其他级别域(从3到无穷)，其中包括一个点和2或3个字面量
这个正则表达式有什么问题?
编辑:它与“something@someth.ing”电子邮件不匹配
当前回答
以下是我从这里收集信息和微软文档后的解决方案:
/// <summary>
/// * TLD support from 2 to 5 chars (modify the values as you want)
/// * Supports: abc@gmail.com.us
/// * Non-sensitive case
/// * Stops operation if takes longer than 250ms and throw a detailed exception
/// </summary>
/// <param name="email"></param>
/// <returns>valid: true | invalid: false </returns>
/// <exception cref="ArgumentException"></exception>
private bool validateEmailPattern(string email) {
try {
return Regex.IsMatch(email,
@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,5})+)$",
RegexOptions.None, TimeSpan.FromMilliseconds(250));
} catch (RegexMatchTimeoutException) {
// throw an exception explaining the task was failed
_ = email ?? throw new ArgumentException("email, Timeout/failed regexr processing.", nameof(email));
}
}
其他回答
作为Alex的流行答案的更新:在。net 5中，MailAddress现在有一个TryCreate。所以你可以这样做:
public static bool IsValidEmail(string email)
{
if (!MailAddress.TryCreate(email, out var mailAddress))
return false;
// And if you want to be more strict:
var hostParts = mailAddress.Host.Split('.');
if (hostParts.Length == 1)
return false; // No dot.
if (hostParts.Any(p => p == string.Empty))
return false; // Double dot.
if (hostParts[^1].Length < 2)
return false; // TLD only one letter.
if (mailAddress.User.Contains(' '))
return false;
if (mailAddress.User.Split('.').Any(p => p == string.Empty))
return false; // Double dot or dot at end of user part.
return true;
}
试试这个尺寸:
public static bool IsValidEmailAddress(this string s)
{
var regex = new Regex(@"[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?");
return regex.IsMatch(s);
}
正则表达式电子邮件模式:
^(?:[\\w\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\`\\{\\|\\}\\~]+\\.)*[\\w\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\`\\{\\|\\}\\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\\-](?!\\.)){0,61}[a-zA-Z0-9]?\\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\\-](?!$)){0,61}[a-zA-Z0-9]?)|(?:\\[(?:(?:[01]?\\d{1,2}|2[0-4]\\d|25[0-5])\\.){3}(?:[01]?\\d{1,2}|2[0-4]\\d|25[0-5])\\]))$
我使用:
public bool ValidateEmail(string email)
{
Regex regex = new Regex("^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$");
if (regex.IsMatch(email))
return true;
return false;
}
如果它不起作用，请告诉我:)
public static bool isValidEmail(this string email)
{
string[] mail = email.Split(new string[] { "@" }, StringSplitOptions.None);
if (mail.Length != 2)
return false;
//check part before ...@
if (mail[0].Length < 1)
return false;
System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(@"^[a-zA-Z0-9_\-\.]+$");
if (!regex.IsMatch(mail[0]))
return false;
//check part after @...
string[] domain = mail[1].Split(new string[] { "." }, StringSplitOptions.None);
if (domain.Length < 2)
return false;
regex = new System.Text.RegularExpressions.Regex(@"^[a-zA-Z0-9_\-]+$");
foreach (string d in domain)
{
if (!regex.IsMatch(d))
return false;
}
//get TLD
if (domain[domain.Length - 1].Length < 2)
return false;
return true;
}
