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  1. <?php
  2.  
  3. $re = '~(?:\[id:|(?!^)\G,)\K\d+~'; 
  4. $strs = array("lorem ipsum 999", "[id:284,286]", "[id:28]"); 
  5. foreach ($strs as $s) {
  6. 	preg_match_all($re, $s, $matches);
  7. 	print_r($matches[0]);
  8. }
Success #stdin #stdout 0.02s 52472KB
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Standard input is empty
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Array
(
)
Array
(
    [0] => 284
    [1] => 286
)
Array
(
    [0] => 28
)
https://ideone.com/HVtTbS
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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