C# Regex repeating match between 2 literals

Question

I extract a string from a pdf from that string I need to get a list of tracking numbers.

My extracted string is like this were "more text" is all the rest of the extracted string.

more text...__FREIGHT: 0.00__SALES TAX: 0.00 __602256510000; 602256510002; 602256500001; TRACKING...more text

I locate the tracking numbers in the string by matching on "TRACKING". Here is my Regex:

((?<TrackingNumber>[a-zA-Z0-9]+);\s)+TRACKING

Here's the problem:
after execution the Group TrackingNumber" only contains the last tracking number, but as stated above in need The Group "TrackingNumber" to have 3 matches, one for each tracking number (without the trailing ";" or space)

Answer 1

You may try the below \\G anchored based regex

(?:;\s|_)(?<TrackingNumber>[a-zA-Z0-9]+)(?=.*?;\s*TRACKING)

DEMO

Answer 2

The way its done in Dot-Net is to use Capture Collections

---

edit: - note that you may want to make the tracking chars optional
[a-zA-Z0-9]* incase there is a missing/blank number mid-stream.
This will continue capturing.
(example: 602256510000; 602256510002;; 602256500001; TRACKING )

---

 # (?:(?<TrackingNumber>[a-zA-Z0-9]+);\s)+TRACKING

 (?:
      (?<TrackingNumber> [a-zA-Z0-9]+ )  #_(1)         
      ; \s 
 )+
 TRACKING

C#:

string pdf = "__602256510000; 602256510002; 602256500001; TRACKING ";
Regex RxTrack = new Regex(@"(?:(?<TrackingNumber>[a-zA-Z0-9]+);\s)+TRACKING");

Match trackMatch = RxTrack.Match( pdf );
if ( trackMatch.Success )
{
    CaptureCollection cc = trackMatch.Groups["TrackingNumber"].Captures;
    for (int i = 0; i < cc.Count; i++)
        Console.WriteLine("[{0}] = {1}", i, cc[i].Value);
}

Output:

[0] = 602256510000
[1] = 602256510002
[2] = 602256500001

Answer 3

这个正则表达式可以接受

(?<TrackingNumber>[\d]+)(?=;)

Answer 4

I think this may help you.

(?<TrackingNumber>[0-9]+)(?=.*?;\sTRACKING)

And for better understanding check this : Regular Expression Lookahead