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  1. <?php
  2. $string = "04/19/2017, 04/20/2017, 04/26/2017, 04/28/2017";
  3.  
  4. $result = preg_replace('%([\d/]+)%sim', '"\1"', $string);
  5.  
  6. print $result;
Success #stdin #stdout 0s 82944KB
stdin
Standard input is empty
stdout
"04/19/2017", "04/20/2017", "04/26/2017", "04/28/2017"