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  1. <?php
  2.  
  3. $string='GET........ref=mp4;GET........ref=flv;GET........ref=mp4;';
  4. $res = explode(";", $string);
  5. $res = preg_grep('/mp4$/i', $res);
  6. print_r($res);
  7.  
Success #stdin #stdout 0.03s 52480KB
stdin
Standard input is empty
stdout
Array
(
    [0] => GET........ref=mp4
    [2] => GET........ref=mp4
)