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  1. <?php
  2.  
  3. $input = '01.jpg02.jpg03.jpg10599335_899600036724556_4656814811345726851_n.jpg11693824_1051832718167953_6310308040295800037_n.jpg11709788_1051835281501030_8503525152567309473_n.jpg12042832_1103685106316047_3711793359145824637_n.jpg';
  4.  
  5. $re = '/(?<=^|\.jpg)\w+\.jpg/m';
  6.  
  7. preg_match_all($re, $input, $matches);
  8.  
  9. print_r($matches[0]);
  10.  
Success #stdin #stdout 0.02s 52472KB
stdin
Standard input is empty
stdout
Array
(
    [0] => 01.jpg
    [1] => 02.jpg
    [2] => 03.jpg
    [3] => 10599335_899600036724556_4656814811345726851_n.jpg
    [4] => 11693824_1051832718167953_6310308040295800037_n.jpg
    [5] => 11709788_1051835281501030_8503525152567309473_n.jpg
    [6] => 12042832_1103685106316047_3711793359145824637_n.jpg
)