如何使用asp.net中的正則表達式使用兩個不同的條件得到一個字符串

Question

我有一個字符串，我必須找到PNR號碼。要獲得PNR號碼，我必須檢查兩個條件：

1. 乘客的首先應該是不止一個。
2. 第二個字符串包含ITINERARY REBOOKED。

如果兩個條件都符合，然後從字符串中只提取PNR編號，否則不返回任何內容。輸入字符串的

例子：

string First=@"RT29WHVE 

RP/NYC1S21DD/NYC1S21DD   WS/SU 6MAY13/0503Z 29WHVE // This is PNR number     
    NYC1S21DD/9525GY/6MAY13               
1.KHOON/FRANCIS 2.MEH/SAY 3.MEH/PRAY 4.MEH/MAW  //Passenger more than one      
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//ETUS             
18 SSR DOCS US HK1 ////09NOV83/M//KHOON/FRANCIS/P1        
19 SSR DOCS US HK1 ////01JAN92/M//MEH/SAY/P2         
20 SSR DOCS US HK1 ////01JAN62/M//MEH/PRAY/P3         
21 SSR DOCS US HK1 ////01JAN96/M//MEH/MAW/P4         
22 SSR DOCS US HK1 ////15APR89/M//REH/LAW/P5         
23 SSR DOCS US HK1 ////11NOV97/M//REH/PAE/P6         
24 SSR DOCS US HK1 ////01JAN59/M//REH/DO/P7          
25 SSR DOCS US HK1 ////05OCT88/M//REH/LEE/P8 
)>SP1                
RP/NYC1S21DD/NYC1S21DD   WS/SU 6MAY13/0503Z XXXXXX     
1.KHOON/FRANCIS                
2 US 152 T 12MAY 7 GEGPHX HK1 300P 534P 12MAY E US/A4PRHM    
3 US 184 T 12MAY 7 PHXLAS HK1 815P 923P 12MAY E US/A4PRHM    
4 US 392 K 13MAY 1 LASCLT HK1 115A 827A 13MAY E US/A4PRHM    
5 US4286 K 13MAY 1 CLTFAY HK1 955A1050A 13MAY E US/A4PRHM    
OPERATED BY SUBSIDIARY/FRANCHISE           
6 MIS 1A HK1 NYC 11JAN-THANK YOU FOR YOUR BUSINESS       
7 AP NYC9103161516               
8 APE FRANCISKHON@GMAIL.COM             
9 TK OK06MAY/NYC1S21DD//ETUS             
10 SSR DOCS US HK1 ////09NOV83/M//KHOON/FRANCIS        
11 OSI US TKT NO 037-7244752856            
12 OSI US TKT NO 037-7244752857            
13 OSI US TKT NO 037-7244752858            
14 OSI US TKT NO 037-7244752859            
15 OSI US TKT NO 037-7244752860            
16 OSI US TKT NO 037-7244752861            
17 OSI US TKT NO 037-7244752862            
18 OSI US TKT NO 037-7244752863  
                  FXR                                 
01 KHOON/FRANC*                 
ITINERARY REBOOKED   //It contain ITINERATY REBOOKED so fetch that PNR numebr              
LAST TKT DTE 06MAY13 - SEE ADV PURCHASE           
------------------------------------------------------------     
    AL FLGT BK DATE TIME FARE BASIS  NVB NVA BG     
    GEG                   
XPHX US 152 K * 12MAY 1500 KXA0NL6P  12MAY12MAY 0P     
    LAS US 184 K * 12MAY 2015 KXA0NL6P  12MAY12MAY 0P     
XCLT US 392 K 13MAY 0115 KXA7NJ6   13MAY13MAY 0P     
FAY US 4286 K 13MAY 0955 KXA7NJ6   13MAY13MAY 0P     

    USD 290.24  12MAY13GEG US X/PHX US LAS144.19KXA0NL6P      
       US X/CLT US FAY146.05KXA7NJ6 USD290.24END      
    USD 21.76US ZP GEG3.90PHX3.90LAS3.90CLT3.90XT USD       
    USD  5.00AY 15.60ZP USD 9.00XF GEG4.50PHX4.50        
    USD 24.60XT                 
    USD 341.60                 
    BG CXR: US                  
    PRICED WITH VALIDATING CARRIER US - REPRICE IF DIFFERENT VC      
>             PAGE 2/ 3     
>"; 

    string Second=@"rt298BFB 
--- TST RLR MSC ---                
    RP/NYC1S21DD/NYC1S21DD   UA/RM 6MAY13/0452Z 298BFB // This is PNR number    
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    
7 MIS 1A HK2 NYC 11JAN-THANK YOU FOR YOUR BUSINESS       
8 MCO XD ARC 06MAY/USD 44.00/*SERVICE FEE/P1         
9 AP NYC5093952712               
10 API CHEAPOAIR, 213 WEST 35TH STREET, SUITE 1201, NEW YORK,     
    NY 10001                 
11 TK OK06MAY/NYC1S21DD//ETUA             
12 SSR SEAT UA KK2 PDXORD/36AN,P1/36BN,P2/RB/S3        
13 SSR SEAT UA KK2 ORDBWI/31FN,P1/31EN,P2/RB/S4        
)>sp1 
--- TST RLR MSC ---                
-ASSOCIATE PNR-                 
RP/NYC1S21DD/NYC1S21DD   UA/RM 6MAY13/0452Z XXXXXX     
    1.BELIEU/KENNETH E(ADT)              
    2 UA 646 Q 22JUN 6*PDXORD HK1 603A1150A 22JUN E UA/GW0LVJ    
    3 UA1735 Q 22JUN 6*ORDBWI HK1 115P 409P 22JUN E UA/GW0LVJ    
    4 UA 209 S 01JUL 1*BWIIAH HK1 545A 800A 01JUL E UA/GW0LVJ    
    5 UA 258 S 01JUL 1*IAHPDX HK1 856A1120A 01JUL E UA/GW0LVJ    
    6 MIS 1A HK1 NYC 11JAN-THANK YOU FOR YOUR BUSINESS       
    7 MCO XD ARC 06MAY/USD 44.00/*SERVICE FEE          
    8 AP NYC5093952712               
    9 API CHEAPOAIR, 213 WEST 35TH STREET, SUITE 1201, NEW YORK,     
    NY 10001                 
    10 TK OK06MAY/NYC1S21DD//ETUA             
    11 SSR SEAT UA KK1 PDXORD/36AN,P1/RB/S2            
    )>FXR 
    FXR                    
01 BELIEU/KENNE*                
    NO REBOOKING REQUIRED FOR LOWEST AVAILABLE FARE //it contain no booking so dont want that PNR number        
LAST TKT DTE 07MAY13 - SEE ADV PURCHASE           
------------------------------------------------------------     
     AL FLGT BK DATE TIME FARE BASIS  NVB NVA BG     
PDX                   
XCHI UA 646 Q 22JUN 0603 QA7KN   22JUN22JUN 0P     
BWI UA 1735 Q 22JUN 1315 QA7KN   22JUN22JUN 0P     
XHOU UA 209 S 01JUL 0545 SA7KN   01JUL01JUL 0P     
PDX UA 258 S 01JUL 0856 SA7KN   01JUL01JUL 0P     

USD 547.91  22JUN13PDX UA X/CHI UA BWI323.72QA7KN UA      
       X/HOU UA PDX224.19SA7KN USD547.91END       
USD 41.09US ZP PDX3.90ORD3.90BWI3.90IAH3.90XT USD       
USD 10.00AY 15.60ZP USD 16.50XF PDX4.50ORD4.50BWI4.50      
USD 32.10XT IAH3.00              
USD 631.10                 
BG CXR: UA                  
PRICED WITH VALIDATING CARRIER UA - REPRICE IF DIFFERENT VC>"; 

我使用目前的正則表達式是(\s[A-Z0-9]{6}\s{2})(?=(.*ITINERARY.REBOOKED.?)) 它會給我包含ITINERARY重新預訂，但我想第一個條件太PNR號。

Answer 1

隨着對問題的評論開始解釋：這裏有很多不明確的地方：如果一個PNR是一個6個字符的字母數字字符串，那麼在輸入字符串中可以匹配許多許多東西，所以更詳細的標準PNR格式和，它看起來確實需要應用。

假設（基於評價和一些猜測）的標準，可以更完全地指定：

• PNR是六個字符大寫字母數字代碼。
• 它出現在輸入的第三行的末尾
  • 該評論出來了，但它很明顯是第三個例子。
  • 起始//的文本已被提問者添加，但實際上並不是輸入的一部分。

的字符串，如果它包含了文字文本ITINERARY REBOOKED只應處理。

因此無需正則表達式：

bool TryGetPnr(string input, out string pnr) { 
    pnr = String.Empty; 

    if (input.IndexOf("ITINERARY REBOOKED", StringComparison.Ordinal) == -1) { 
    return false; 
    } 

    // Get the 3rd line (index 2) without building too much of a temporary array 
    // This assumes \r\n line endings. 
    var line3 = input.Split(new [] { Environment.NewLine }, 4, StringSplitOptions.None)[2]; 

    pnr = line3.Substring(line3.Length - 6); 
    return true; 
} 

但你需要仔細指定你想要什麼，以確保您只想要什麼正確提取啓動。目前這個問題的格式規範充其量是模糊的。