Regular Expression to check valid email address [duplicate]

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Possible Duplicate:

Validating an email Address in C#

Hi,

I'm trying to create regular expression to check valid email address, but the following code not returning any output.

foreach(Match m in (Regex.Matches("Jack@yahoo.com","^([a-zA-Z])+(?:\\d)*?@\\1\\.\\1{2,4}$")))
    {   
        Console.WriteL开发者_高级运维ine("{0} found at index{1}",m.Value,m.Index);
    }

Could anyone please tell what's wrong I'm doing?

---

Try this

    foreach(Match m in (Regex.Matches("Jack@yahoo.com","^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$")))
    {   
        Console.WriteLine("{0} found at index{1}", m.Value, m.Index);
    }