//Regex needs more testing

public const string CLAIMS_REGEX = @"(?<IdentityClaim>[ic])?:?0(?<ClaimType>[#\.5\!\+\-%?\\])(?<ClaimValueType>[\.\+])(?<AuthMode>[wstmrfc])(\|(?<OriginalIssuer>[^\|]*))?(\|(?<ClaimValue>.*))";

  

public static string GetAdUserIdForClaim(string login)

{

    string userName = login;

  

    foreach (Match m in Regex.Matches(login, CLAIMS_REGEX, RegexOptions.IgnoreCase))

    {

        try

        {

            if (m.Groups["AuthMode"].Captures[0].Value.ToLower() == "w")

            {

                userName = m.Groups["ClaimValue"].Captures[0].Value;

            }

        }

        catch { }

    }

    return userName;

}

  

public static string GetClaimForAdUserId(string login)

{

    string userName = login;

    SPClaimProviderManager mgr = SPClaimProviderManager.Local;

    if (mgr == null) return userName;

  

    SPClaim claim = new SPClaim(SPClaimTypes.UserLogonName, login, "http://www.w3.org/2001/XMLSchema#string", SPOriginalIssuers.Format(SPOriginalIssuerType.Windows));

    userName = mgr.EncodeClaim(claim);

  

    return userName;

}

  

public static bool IsLoginClaims(string login)

{

    Regex re = new Regex(CLAIMS_REGEX, RegexOptions.IgnoreCase);

    return re.IsMatch(login);

}