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  1. <?php
  2.  
  3.     $str = '{c}
  4.     <br>
  5.     <br>
  6.     test
  7.     test<br>
  8.     <br>{/c}
  9.     <br>
  10.     test
  11.     test<br>
  12.  
  13.     {c}
  14.     saddasda<br>
  15.     {/c}
  16.  
  17.     {c}<br>test<br><br>{/c}
  18.     {c}<br>{/c}';
  19.     $new_str = preg_replace_callback('#(?<=\{c\}).*?(?=\{/c\})#s', function($matches) {
  20.         return str_replace("<br>", "[linebreak]", $matches[0]);
  21.     },$str);
  22.     echo $new_str;
  23.  
Success #stdin #stdout 0.02s 23688KB
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stdin
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Standard input is empty
stdout
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{c}
    [linebreak]
    [linebreak]
    test
    test[linebreak]
    [linebreak]{/c}
    <br>
    test
    test<br>
    
    {c}
    saddasda[linebreak]
    {/c}
    
    {c}[linebreak]test[linebreak][linebreak]{/c}
    {c}[linebreak]{/c}
https://ideone.com/0I5HPS
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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