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  1. <?php
  2.  
  3. $x = "@hello, @@hello, @hello, @@hello";
  4. $temp = '@hello';
  5. $x = preg_replace("/(?<!@)".$temp."/", "replaced", $x);
  6. echo $x;
Success #stdin #stdout 0.03s 52480KB
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Standard input is empty
stdout
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replaced, @@hello, replaced, @@hello
https://ideone.com/9s3L82
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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