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  1. <?php
  2. $str = 's_113_2.3gp';
  3. $n = preg_match('/(?<=_)\d+(?=\.)/', $str, $m) ? $m[0] : "";
  4. print($n);
  5. ?>
Success #stdin #stdout 0.02s 13064KB
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https://ideone.com/PMrJiy
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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