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  1. <?php
  2.  
  3. $str = 'T4MAX';
  4.  
  5. var_dump(preg_replace('~\d(?=\D*$)~', '$0 ', $str));
Success #stdin #stdout 0.01s 20520KB
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Standard input is empty
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string(6) "T4 MAX"
https://ideone.com/Mqqqsh
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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