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  1. <?php
  2.  
  3. $re = '~\((?>[^()]++|(?R))*\)~'; 
  4. $str = "Lorem ipsum (dolor sit \r\namet (consectetur adipiscing\r\n elit) sed do eiusmod) tempor \r\n(incididunt) ut \r\nlabore."; 
  5. $output = preg_replace_callback($re, function($m) {
  6. 	return str_replace("\r\n", "", $m[0]);
  7. }, $str);
  8. echo $output;
Success #stdin #stdout 0.02s 52432KB
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stdin
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Standard input is empty
stdout
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Lorem ipsum (dolor sit amet (consectetur adipiscing elit) sed do eiusmod) tempor 
(incididunt) ut 
labore.
https://ideone.com/1XWVOS
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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