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  1. <?php
  2.  
  3. $str = '    But I must explain to you how all this mistaken';
  4. echo preg_replace('/(?= )\s+|(\w).*/u', '$1', $str);
Success #stdin #stdout 0.02s 24472KB
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https://ideone.com/RHnEys
language:
PHP (php 7.3.5)
created:
4 years ago
visibility:
public

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