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  1. <?php
  2.  
  3. $str = "oiEusouMuitoLegal";
  4.  
  5. echo preg_replace('/(?<!\ )[A-Z]/', ' $0', $str);
Success #stdin #stdout 0.01s 20568KB
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oi Eusou Muito Legal
https://ideone.com/tmtqmG
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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