验证字符串是否是有效的电子邮件地址的最优雅的代码是什么?
当前回答
/使用内部Regex在.Net4.5 >>>中创建“new EmailAddressAttribute();”组件,使用System.ComponentModel.DataAnnotations; //验证邮箱地址......测试和工作。
public bool IsEmail(string email)
{
if (String.IsNullOrEmpty(email))
{ return false; }
try
{
Regex _regex = new Regex("^((([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\\u" +
"FDF0-\\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-\\uFF" +
"EF])))\\.?$", RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture | RegexOptions.Compiled);
return _regex.IsMatch(email);
}
catch (RegexMatchTimeoutException)
{
return false;
}
}
你也可以用这个:
http://msdn.microsoft.com/en-us/library/01escwtf (v = vs.110) . aspx
其他回答
我认为最好的方法如下:
public static bool EmailIsValid(string email)
{
string expression = "\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";
if (Regex.IsMatch(email, expression))
{
if (Regex.Replace(email, expression, string.Empty).Length == 0)
{
return true;
}
}
return false;
}
你可以在一个通用类中使用这个静态函数。
For the simple email like goerge@xxx.com, below code is sufficient.
public static bool ValidateEmail(string email)
{
System.Text.RegularExpressions.Regex emailRegex = new System.Text.RegularExpressions.Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");
System.Text.RegularExpressions.Match emailMatch = emailRegex.Match(email);
return emailMatch.Success;
}
这可能是对文本框进行电子邮件验证的最佳方式。
string pattern = null;
pattern = "^([0-9a-zA-Z]([-\\.\\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\\w]*[0-9a-zA-Z]\\.)+[a-zA-Z]{2,9})$";
if (Regex.IsMatch("txtemail.Text", pattern))
{
MessageBox.Show ("Valid Email address ");
}
else
{
MessageBox.Show("Invalid Email Email");
}
只要在任何你想要的函数中包含。
Personally, I would say that you should just make sure there is an @ symbol in there, with possibly a . character. There's many regexes you could use of varying correctness, but I think most of these leave out valid email addresses, or let invalid ones through. If people want to put in a fake email address, they will put in a fake one. If you need to verify that the email address is legit, and that the person is in control of that email address, then you will need to send them an email with a special coded link so they can verify that it indeed is a real address.
电子邮件地址验证并不像看起来那么简单。实际上,从理论上讲,仅使用正则表达式完全验证电子邮件地址是不可能的。
请查看我的博客文章,了解关于这个主题的讨论以及使用FParsec的f#实现。[/ shameless_plug]
推荐文章
- 在c#中从URI字符串获取文件名
- 检查SqlDataReader对象中的列名
- 如何将类标记为已弃用?
- c# 8支持。net框架吗?
- Linq-to-Entities Join vs GroupJoin
- 为什么字符串类型的默认值是null而不是空字符串?
- 在list中获取不同值的列表
- 组合框:向项目添加文本和值(无绑定源)
- 如何为ASP.net/C#应用程序配置文件值中的值添加&号
- 从System.Drawing.Bitmap中加载WPF BitmapImage
- 如何找出一个文件存在于c# / .NET?
- 为什么更快地检查字典是否包含键,而不是捕捉异常,以防它不?
- [DataContract]的命名空间
- string. isnullorempty (string) vs. string. isnullowhitespace (string)
- 完全外部连接