Remove domain information from login id in C#

Question

I would like to remove the domain/computer information from a login id in C#. So, I would like to make either "Domain\me" or "Domain\me" just "me". I could always check for the existence of either, and use that as the index to start the substring...but I am looking for something more elegant and compact.

Worse case scenario:

int startIndex = 0;
int indexOfSlashesSingle = ResourceLoginName.IndexOf("\");
int indexOfSlashesDouble = ResourceLoginName.IndexOf("\\");
if (indexOfSlashesSingle != -1)
    startIndex = indexOfSlashesSingle;
else
    startIndex = indexOfSlashesDouble;
string shortName = ResourceLoginName.Substring(startIndex, ResourceLoginName.Length-1);

Answer 1

when all you have is a hammer, everything looks like a nail.....

use a razor blade ----

using System;
using System.Text.RegularExpressions;
public class MyClass
{
    public static void Main()
    {
        string domainUser = Regex.Replace("domain\\user",".*\\\\(.*)", "$1",RegexOptions.None);
        Console.WriteLine(domainUser);  

    }

}

Answer 2

You could abuse the Path class, thusly:

string shortName = System.IO.Path.GetFileNameWithoutExtension(ResourceLoginName);

Answer 3

How's about:

string shortName = ResourceLoginName.Split('\\')[1]

Answer 4

This will work for both but with named groups.

^(?<domain>.*)\\(?<username>.*)|(?<username>[^\@]*)@(?<domain>.*)?$

Answer 5

I always do it this way:

    string[] domainuser;
    string Auth_User = Request.ServerVariables["AUTH_USER"].ToString().ToLower(); 
    domainuser = Auth_User.Split('\\');

Now you can look at domainuser.Length to see how many parts are there and domainuser[0] for the domain and domainuser[1] for the username.

Answer 6

        string theString = "domain\\me";
        theString = theString.Split(new char[] { '\\' })[theString.Split(new char[] { '\\' }).Length - 1];

Answer 7

This works for both valid domain logins:

var regex = @"^(.*\\)?([^\@]*)(@.*)?$";
var user = Regex.Replace("domain\\user", regex, "$2", RegexOptions.None);
user = Regex.Replace("user@domain.com", regex, "$2", RegexOptions.None);

Answer 8

Piggy backing on Derek Smalls Answer...

Regex.Replace(User.Identity.Name,@"^(?<domain>.*)\\(?<username>.*)|(?<username>[^\@]*)@(?<domain>.*)?$", "${username}", RegexOptions.None)

worked for me.