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  1. <?php
  2.  
  3. $text = "a b c";
  4. $replacement = array("a b(?! c\b)" => "ab","b c" => "bc");
  5. $search = array_map(function($v){
  6.     return preg_quote($v, "/");
  7. }, array_keys($replacement));
  8.  
  9. echo $text = preg_replace_callback("/\b(" . implode("|", $search) . ")\b/", function($m)use($replacement){
  10.     return $replacement[$m[1]];
  11. }, $text);
Success #stdin #stdout 0.04s 52480KB
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a bc
https://ideone.com/SIA8ES
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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