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I am new to C# and don't know how to get the substrings in an email address.

For example if email address is: name.surname@company.com or support@company.com I want to know how I can separate the information from this email address?

Like name.surname@company.com 

string _name = name;
string _surname = surname;
string _company = company;
string domaine = company.com;

Or if it is only support@company.com then

string _name = support;
string _company = company;
string domaine = company.com

Thank you for your help

chue x
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harjidner randhawa
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    use [String.Split](http://msdn.microsoft.com/en-us/library/system.string.split(v=vs.110).aspx), first to split on `@` and then split on `.` – Habib Sep 09 '14 at 20:15
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    ya but email adress can b name.surname or only support. I mean if i apply String.Split how can it veryfy in case if there is no "." ? – harjidner randhawa Sep 09 '14 at 20:20
  • @harijnder, in that case split would return the whole string in first element. – Habib Sep 09 '14 at 20:21
  • @harjidner, this is a question I count as stemming from you needing to learn to program rather than a programmer who got stumped. Please don't take this as any discouragement. I wholeheartedly encourage you to learn. But to me, the purpose of StackOverflow isn't to teach the elementary basics of programming. With that said, if you don't find your answer, shoot me an email and i'll try to give you an answer. I can give you my Skype name where I'm online a lot too. I'm happy to help you, but I feel this is a wasted question on StackOverflow, so I don't want to post a solution here. – Edward Sep 09 '14 at 20:33

3 Answers3

6

You can use MailAddress class for this.

var mail = new MailAddress("name.surname@company.com");
var user = mail.User; // name.surname
var host = mail.Host; // company.com
Selman Genç
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  • It is not a bad option, OP can `MailAddress.Host` for company.com and then split `MailAddress.User` to get first and last name – Habib Sep 09 '14 at 20:18
  • This is the correct answer. Create a new MailAddress(email) and then refer to the properties to get each piece. This will be much more reliable. – DLeh Sep 09 '14 at 20:18
  • @Selman22 hi selman thank you for your reply. Actualy I tried but couldnt make get any result. – harjidner randhawa Sep 09 '14 at 20:18
  • I have added an example, there is also another example in the documentation I linked.. – Selman Genç Sep 09 '14 at 20:22
  • @harjidnerrandhawa, you will still need to split the 'user' variable in the above code. when you split, if the character is not in the string, then the returned array has only one item. so `string[] items = "company".Split('.');` has 'items' with one item in it. – Edward Sep 09 '14 at 20:39
  • but `string[] items = "name.surname".Split('.');` has two items: "name" and "surname" in the `items` array. Maybe that's enuf to get you started. Happy coding! – Edward Sep 09 '14 at 20:40
  • @Edwards, Selman22 : TO check if "user" contains "." should i write if(user.contains("."){} ?? – harjidner randhawa Sep 09 '14 at 20:53
3

Yet Another option:

string email = "thisemail@hotmail.com";

string user = email.Substring(0, email.IndexOf("@"));
string domain = email.Substring(email.IndexOf("@")+1);
string company = string.Empty;

if (domain.Contains(".")) //just in case no '.'
{
    company = domain.Substring(0, domain.IndexOf("."));
}
else
{
    company = domain;
}
Joe_Hendricks
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0

Parsing email addresses is...a little more complex than you might think. My answer to the question, C# Email Address validation , might be of use to you. It won't match all legal email addresses, but it should match pretty much every one you'll ordinarily see.

If you use the regular expression I build up in my answer above, you should be able to extract the local-part like this:

Match  m         = RxEmailAddress.Match( "foo@bar.com" ) ;
string localPart = m.Success ? m.Groups["localpart"].Value : null ;

Here's another way to get what you want. We write a regular expression to break the local-part up into segments. We're using the option RegexOptions.ExplicitCapture to control what we capture. In this case, that only the words of the local part.

Regex rx = new Regex( @"^(?<first>[^.@]+)(\.(?<next>[^.@]+))*@.+$" , RegexOptions.ExplicitCapture ) ;

Once we have that, we can match an email address, thus:

Match m  = rx.Match( "foo.bar.bazbat.schazam@domain.com" ) ;

Assuming success, we can parse out each segment of the local-part into an array like so:

if ( m.Success )
{
  string[] segments = m.Groups.Cast<Group>()
                      .Skip(1)
                      .SelectMany( g => g.Captures.Cast<Capture>() )
                      .Select( c => c.Value )
                      .ToArray()
                      ;
}

In the above code,

  • We skip the first group as it contains the entire match and that's not that interesting.
  • We use SelectMany() to collect the list of captures for each match group and then flatten the resulting list-of-lists into a single list of captures.
  • We then select the value of each capture, and
  • pump it into an array.

FWIW, here's the regular expression to match the full panoply of RFC 822 email addresses. The standard has moved on since RFC 822, so this is likely incomplete:

(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
)+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:
\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(
?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ 
\t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\0
31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\
](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+
(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:
(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)
?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\
r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[
 \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)
?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t]
)*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[
 \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*
)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
)+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)
*:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+
|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r
\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:
\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t
]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031
]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](
?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?
:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?
:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?
:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?
[ \t]))*"(?:(?:\r\n)?[ \t])*)*:(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] 
\000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|
\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>
@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"
(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t]
)*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?
:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[
\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-
\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(
?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;
:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([
^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\"
.\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\
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r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] 
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00-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\
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\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[
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]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)(?:,\s*(
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])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t
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".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?
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\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:
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"()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])
*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])
+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\
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?:\r\n)?[ \t])*))*)?;\s*)
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Nicholas Carey
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