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  1. <?php
  2.  
  3. $s = '[gallery ids="1955,1947,1951,1945,1953,1949"]';
  4. preg_match_all('~(?:\[gallery[^][]+\bids="|(?!^)\G),?\K\d+~', $s, $ids);
  5. print_r($ids[0]);
  6.  
Success #stdin #stdout 0.02s 52432KB
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stdin
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Standard input is empty
stdout
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Array
(
    [0] => 1955
    [1] => 1947
    [2] => 1951
    [3] => 1945
    [4] => 1953
    [5] => 1949
)
https://ideone.com/IAaEku
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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