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  1. <?php
  2.  
  3. $fileName ='Don.a&ld #Duck .jpg';
  4. echo $filename = preg_replace('/[^a-z0-9](?![^.]*$)/i', '_', $fileName);
Success #stdin #stdout 0.01s 52488KB
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stdin 
Standard input is empty
stdout 
Don_a_ld__Duck_.jpg
https://ideone.com/3CDFCp
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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