string content = "";
            string regex = "slot=(?<slot>\\d+)\\s+port=(?<port>\\d+)\\s+vlan=(?<vlan>\\d+)\\s+PPP\\s+(?<src>.*?)\\s+\\" +
"d+\\.\\d+\\.\\d+\\.\\d\\s+(?<mac>.*?)\\s+(?<date>\\d{4}-\\d{1,2}-\\d{1,2}\\s*\\d{1,2}:\\d{1,2}" +
":\\d{1,2})\\s+\\(55\\)(?<last>[\\S]+?\\s+[\\S]+?\\s+[\\S]+?)\\s";
            System.Text.RegularExpressions.RegexOptions options = System.Text.RegularExpressions.RegexOptions.IgnoreCase;
            System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(regex, options);
            foreach (System.Text.RegularExpressions.Match item in reg.Matches(content))
            {
                string solt = item.Groups["slot"].Value;
                .
                .
                .
                //以此类推,分别取其组的值,存入数据库
            }

------解决方案--------------------
C# code

        private void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();

            Regex anExpr = new Regex(@"slot=(?<slot>\d+).*?port=(?<port>\d+).*?vlan=(?<vlan>\d+).*?(?<host>\w+@\w+).*?(?<ID>[\w|-]{17}).*?(?<date>[\d|:|-]{10}).*?(?<time>[\d|:|-]{8})\s+(?<tag>\(\d+\).*?)\s+参考.*?-+",
                RegexOptions.IgnoreCase | RegexOptions.Singleline);
            Match amt = anExpr.Match(textBox1.Text);
            while (amt.Success)
            {
                //匹配开始 
                listBox1.Items.Add("!!!!");
                listBox1.Items.Add("slot=" + amt.Groups["slog"].Value);
                listBox1.Items.Add("port=" + amt.Groups["port"].Value);
                listBox1.Items.Add("host=" + amt.Groups["host"].Value);
                listBox1.Items.Add("date=" + amt.Groups["date"].Value);
                listBox1.Items.Add("id=" + amt.Groups["ID"].Value);
                listBox1.Items.Add("tag=" + amt.Groups["tag"].Value);
                listBox1.Items.Add("vlan=" + amt.Groups["vlan"].Value);
                listBox1.Items.Add(&quo