如何在同一字符串上匹配两个条件以使用正则表达式获得一个输出

我有一个字符串，我必须找到PNR号码。要获得PNR号码，我必须检查两个条件:

第一乘客必须多于一个

第二个字符串包含重新预订的行程。

如果两个条件都满足，则只从字符串中提取PNR号，否则不返回任何值。

满足第一个条件的代码。

public DataTable GetPnr(List<string> request) // Here we create the function for get pnr.
{
    dt.Columns.Add("PNR", typeof(string));
    foreach (string data in request)
    {
        string item = data;
        dr = dt.NewRow();
        if (item.ToLower().Contains("itinerary rebooked") || item.ToLower().Contains("itineraryrebooked")) // Condition for operated by cases
        {
            Regex regexs = new Regex(@"('s[A-Z0-9]{6}'s{2})"); // Regular operation for PNR.
            foreach (Match m in regexs.Matches(item))
            {
                output = m.ToString(); // Here we store the PNR value in output string variable.
            }
            dr["PNR"] = output;
            dt.Rows.Add(dr);
        }
    }
    return dt;
} 

现在，当我使用正则表达式检查同一正则表达式中的多个乘客时我在函数中使用的是不返回任何输出

这是我想要检查两个条件的字符串:

protected void Button1_Click(object sender, EventArgs e)
{
    List<String> YMT1 = new List<String>();
    string ymt = @"RT29WHVE
                                                            
RP/NYC1S21DD/NYC1S21DD            WS/SU   6MAY13/0503Z   29WHVE //29WHVE is the PNR number                
NYC1S21DD/9525GY/6MAY13                                                         
  1.KHOON/FRANCIS   2.MEH/SAY   3.MEH/PRAY   4.MEH/MAW                          
  5.REH/LAW   6.REH/PAE   7.REH/DO   8.REH/LEE   9.REH/HEH                      
 10  US 152 T 12MAY 7 GEGPHX HK9   300P 534P 12MAY  E  US/A4PRHM                
 11  US 184 T 12MAY 7 PHXLAS HK9   815P 923P 12MAY  E  US/A4PRHM                
 12  US 392 K 13MAY 1 LASCLT HK9   115A 827A 13MAY  E  US/A4PRHM                
 13  US4286 K 13MAY 1 CLTFAY HK9   955A1050A 13MAY  E  US/A4PRHM                
 OPERATED BY SUBSIDIARY/FRANCHISE                                           
 14 MIS 1A HK9 NYC 11JAN-THANK YOU FOR YOUR BUSINESS                            
 15 AP NYC9103161516                                                            
 16 APE FRANCISKHON@GMAIL.COM                                                   
 17 TK OK06MAY/NYC1S21DD//ETU 
 FXR                                                           
 01 KHOON/FRANC*                                                                
 ITINERARY REBOOKED                                                             
 LAST TKT DTE 06MAY13 - SEE ADV PURCHASE  ";
     string ymt2 = @"RP/NYC1S21DD/NYC1S21DD            UA/RM   6MAY13/0452Z       298BFB                
 NYC1S21DD/9999WS/6MAY13                                                        
 1.BELIEU/KENNETH E(ADT)   2.BELIEU/RUTH J(ADT)                               
 3  UA 646 Q 22JUN 6*PDXORD HK2   603A1150A 22JUN  E  UA/GW0LVJ               
 4  UA1735 Q 22JUN 6*ORDBWI HK2   115P 409P 22JUN  E  UA/GW0LVJ               
 5  UA 209 S 01JUL 1*BWIIAH HK2   545A 800A 01JUL  E  UA/GW0LVJ               
 6  UA 258 S 01JUL 1*IAHPDX HK2   856A1120A 01JUL  E  UA/GW0LVJ               
)>FXR                                                                                
01 BELIEU/KENNE*                                                               
NO REBOOKING REQUIRED FOR LOWEST AVAILABLE FARE                                
LAST TKT DTE 07MAY13 - SEE ADV PURCHASE";
    string ymt3 = @"RP/NYC1S21DD/NYC1S21DD            WS/SU   6MAY13/0509Z   Y33ORG //Y33ORG is the PNR number               
NYC1S21DD/80948W/6MAY13                                                        
1.CORTES RIVERA/MARIA(ADT)                                              
2  UA1162 W 21JUN 5*BQNEWR HK6   150A 545A 21JUN  E  UA/GW176R               
3  UA1209 W 21JUN 5*EWRLAX HK6   700A 955A 21JUN  E  UA/GW176R               
4  UA 398 V 17JUL 3 LAXEWR HK6  1040A 705P 17JUL  E  UA/GW176R        ";       
    YMT.Add(ymt);
    YMT.Add(ymt2);
    YMT.Add(ymt3);  
    Split sp = new Split();
    DataTable dt = sp.GetPnr(YMT); 
}

根据我的代码，我取所有包含行程重新预订的PNR，但我也想如果我只有一个行程重新预订的pax，那么它不会获取PNR号码就像在t3中，我有行程重新预订条件，但只有一个人，所以我不想取PNR号码

 public DataTable GetPNR(List<string> Request)  // Here we create the function for get pnr.
    {
        dt.Columns.Add("PNR", typeof(string));
        foreach (string data in Request)
        {
            string item = data;
            dr = dt.NewRow();
            Regex regex = new Regex(@"('d+'.[a-zA-Z]'S(.+))", RegexOptions.IgnoreCase | RegexOptions.Compiled);
            foreach (Match m in regex.Matches(item))
            {
                name = m.ToString();
            }
            if((item.ToLower().Contains("itinerary rebooked") || item.ToLower().Contains("itineraryrebooked"))&&name!=null) // Condition for operated by cases
            {
                Regex regexs = new Regex(@"('s[A-Z0-9]{6}'s{2})"); // Regular operation for PNR.
                foreach (Match m in regexs.Matches(item))
                {
                    output = m.ToString(); // Here we store the PNR value in output string variable.
                }

            }
            dr["PNR"] = output;
            dt.Rows.Add(dr);
        }
        return dt;
    }`enter code here`