Preg_match / split barcode

I am struggeling with reading a GS1-128 barcode, and trying to split it up into the segments it contains, so I can fill out a form automatically.

But I can't figure it out. Scanning my barcode gives me the following: ]d2010704626096200210KT0BT2204[GS]1726090021RNM5F8CTMMBHZSY7

So I tried starting with preg_match and made the following:

/]d2[01]{2}\d{14}[10|17|21]{2}(\w+)/

Which gives me this result:

Array ( [0] => ]d2010704626096200210KT0BT2204 [1] => KT0BT2204 )

Now [1] is actually correct, men [0] isnt, so I have run into a wall.

In the end, this is the result I would like (without 01,10,17,21):

(01) 07046260962002
(10) KT0BT2204
(17) 60900
(21) RNM5F8CTMMBHZSY7

01 - Always 14 chars after
17 - Always 6 chars after

10 can be up to 20 chars, but always has end delimiter <GS> - But if barcode ends with 10 <GS> is not present

21 can be up to 20 chars, but always has end delimiter <GS> - But if barcode ends with 21 <GS> is not present

I tried follwing this question: GS1-128 and RegEx But I couldnt figure it out.

Anyone that can help me?

Solution

This regex should do what you want (note I've split it into separate lines for clarity, you can use it like this with the x (extended) flag, or convert it back to one line):

^]d2(?:
01(?P<g01>.{14})|
10(?P<g10>(?:(?!\[GS]).){1,20})(?:\[GS]|$)|
17(?P<g17>.{6})|
21(?P<g21>(?:(?!\[GS]).){1,20})(?:\[GS]|$)
)+$

It looks for

start-of-line ^ followed by a literal ]d2 then one or more of
01 followed by 14 characters (captured in group g01)
10 followed by up to 20 characters, terminated by either [GS] or end-of-line (captured in group g10)
17 followed by 6 characters (captured in group g17)
21 followed by up to 20 characters, terminated by either [GS] or end-of-line (captured in group g21)
finishing with end-of-line $

Note that we need to use tempered greedy tokens to avoid the situation where a 10 or 21 code might swallow a following code (as in the second example in the regex demo below).

Demo on regex101

In PHP:

$barcode = ']d201070462608682672140097289158930[GS]10101656[GS]17261130';

preg_match_all('/^]d2(?:
01(?P<g01>.{14})|
10(?P<g10>(?:(?!\[GS]).){1,20})(?:\[GS]|$)|
17(?P<g17>.{6})|
21(?P<g21>(?:(?!\[GS]).){1,20})(?:\[GS]|$)
)+$/x', $barcode, $matches);

print_r($matches);

Output:

Array
(
    [0] => Array
        (
            [0] => ]d201070462608682672140097289158930[GS]10101656[GS]17261130
        )

    [g01] => Array
        (
            [0] => 07046260868267
        )

    [1] => Array
        (
            [0] => 07046260868267
        )

    [g10] => Array
        (
            [0] => 101656
        )

    [2] => Array
        (
            [0] => 101656
        )

    [g17] => Array
        (
            [0] => 261130
        )

    [3] => Array
        (
            [0] => 261130
        )

    [g21] => Array
        (
            [0] => 40097289158930
        )

    [4] => Array
        (
            [0] => 40097289158930
        )

)

Demo on 3v4l.org