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<?php
 
$re = '/(?:\G(?!\A)|\A(?=\d+\z))\d/';
$str = '1234567890';
if (preg_match_all($re, $str, $matches)) {
	print_r($matches[0]);
}

Success #stdin #stdout 0.02s 23764KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 0
)

https://ideone.com/GL9krd

language:

PHP (php 7.3.5)

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