IrcDotNet.IrcBot.GetClientFromServerNameMask C# (CSharp) Method

        protected IrcClient GetClientFromServerNameMask(string serverNameMask)
        {
            var client = this.Clients.SingleOrDefault(c => c.ServerName != null &&
                Regex.IsMatch(c.ServerName, serverNameMask, RegexOptions.IgnoreCase));
            if (client == null)
            {
                throw new IrcBotException(IrcBotExceptionType.NoConnection,
                    string.Format("No connection", serverNameMask));
            }
            return client;
        }