split string in substring using a string delimiter

Question

I've a string message that could be like

"TRX00  abcd 20150921    "

or like (n) times that string, I.e.

"TRX00  abcd 20150921    TRX00  abcd 20150921    TRX00  abcd 20150921    "

etc..

How can I split that string in (n) strings using "TRX" at the beginning of each substring like a delimiter?

I want to take the delimiter "TRX" in the substring.

I've done the following but it's doesn't work well..

string msg = "TRX00  abcd 20150921    TRX00  abcd 20150921    TRX00  abcd 20150921    ";

string[] _msg;
string pattern = "(TRX)";
string msg2 = "";

if(msg.Contains("TRX"))
{
    _msg = Regex.Split(msg, pattern);

    foreach (string ok in _msg)
    {
        msg2 = ok;
        MessageBox.Show(msg2);
    }
}

The expected result should be an array of substrings like:

{ "TRX00 abcd 20150921 ", "TRX00 abcd 20150921 ", etc.. }

the expected result should be an array of substrings like: { "TRX00 abcd 20150921 ", "TRX00 abcd 20150921 ", etc.. } — Luke
– Luke, Commented Sep 30, 2015 at 15:15
trim then split on the 4 whitespaces " " that delimit the groups. — Alex K.
– Alex K., Commented Sep 30, 2015 at 15:16
the number of chars inside each substring may be different each time.. the only part that is the same is the delimiter "TRX" — Luke
– Luke, Commented Sep 30, 2015 at 15:18

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

You can use this pattern in your code instead of (TRX):

(?!^)(?=TRX)

It will split on TRX as long as it isn't at the start of the string and returns:

TRX00 abcd 20150921

TRX00 abcd 20150921

TRX00 abcd 20150921

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Sep 30, 2015 at 15:18

lintmouse

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1 Comment

Luke Over a year ago

This regex pattern works like a charm! Thank you @dustmouse

Codor · Accepted Answer · 2015-09-30 15:19:39Z

0

Apparently, the desired strings are 19 characters long; you could truncate the beginning as long as the overall length of the input is larger as follows; however this solution is not very robust to a change of the input format, which makes it questionable.

List<String> Messages = new List<String>();
while (msg.length > 19)
{
    var Message = msg.Substring(19);
    Messages.Add(Message);
    msg = msg.Substring(20, msg.Length-1);
}

answered Sep 30, 2015 at 15:19

Codor

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2 Comments

Broots Waymb Over a year ago

I count a length of 20, not 19.

Luke Over a year ago

the lenght can be different each time, the only part that is the same is the delimiter "TRX"

juharr · Accepted Answer · 2015-09-30 15:24:14Z

0

If you do actually treat "TRX" like a delimiter you can split the string using that, something like:

string msg = "TRX00  abcd 20150921    TRX00  abcd 20150921    TRX00  abcd 20150921    ";
string[] strings = msg.Split(new[] { "TRX" }, StringSplitOptions.None)
                      .Select(x => "TRX" + x)
                      .Skip(1)
                      .ToArray();

You can then transform that delimited collection and add the "TRX" back on. Note I skip the first element (Skip(1)) as in this example that would just be am empty string.

edited Sep 30, 2015 at 15:24

juharr

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answered Sep 30, 2015 at 15:18

TVOHM

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