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  1. <?php
  2.  
  3.  
  4. $str='first , second ,, third, ,fourth   suffix';
  5. echo preg_replace('~\s*(?:(,)\s*)+|(\s)+~', '$1$2', $str) . PHP_EOL;
  6. echo preg_replace('~\s*(?:([,\s])\s*)+~', '$1', $str);
Success #stdin #stdout 0.02s 26312KB
comments (?)
stdin 
Standard input is empty
stdout 
first,second,third,fourth suffix
first,second,third,fourth suffix
https://ideone.com/jPZ8qj
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
secret

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