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<?php
 
$re = "/\\d+,\\d+/"; 
$str = "1,2,3,4,5,6,7,8"; 
preg_match_all($re, $str, $matches);
print_r($matches);

Success #stdin #stdout 0.02s 52432KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => Array
        (
            [0] => 1,2
            [1] => 3,4
            [2] => 5,6
            [3] => 7,8
        )

)

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PHP (php 7.3.5)

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