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  1. <?php                                                                                                                                                                                                                                        
  2. $str = <<<STR
  3. StackOverflow<br>
  4. <br>
  5. <br>
  6. <br>
  7. <br>
  8. is
  9. <br>
  10. <br>
  11. <br>
  12. <br>
  13. a
  14. <br>
  15. community.
  16. STR;
  17. echo preg_replace("!(<br(?: /)?>\s){2,}!s", "<br />\n<br />\n", $str);
Success #stdin #stdout 0.01s 20568KB
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StackOverflow<br />
<br />
is
<br />
<br />
a
<br>
community.
https://ideone.com/KtQGpe
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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