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  1. <?php
  2.  
  3. $filenames = array(
  4.     'Vacation (10).png',
  5.     'Vacation (Me and Mom) (21).png',
  6.     'Vacation (5) (1).png',
  7. );
  8.  
  9. foreach ( $filenames as $filename ) {
  10.     if ( preg_match( '/^.*\((\d+)\)/s', $filename, $matches ) ) {
  11.         echo "$filename => $matches[1]\n";
  12.     } else {
  13.         echo "$filename => no match!\n";
  14.     }
  15. }
  16.  
Success #stdin #stdout 0.03s 25752KB
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stdin
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Standard input is empty
stdout
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Vacation (10).png => 10
Vacation (Me and Mom) (21).png => 21
Vacation (5) (1).png => 1
https://ideone.com/HVld1y
language:
PHP (php 7.3.5)
created:
1 day ago
visibility:
public

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