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  1. <?php
  2.  
  3. $digits = '17555971453827';
  4. $out = preg_replace('/\B(?=(\d{4})+(?!\d))/', '-', $digits);
  5. echo $out; // 17-5559-7145-3827
Success #stdin #stdout 0.03s 26328KB
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17-5559-7145-3827
https://ideone.com/3V9Pts
language:
PHP (php 7.3.5)
created:
14 days ago
visibility:
public

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