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  1. <?php
  2.  
  3. $inputs= array("===Heading 3===","====Heading 4====");
  4. foreach($inputs as $input) {
  5.         echo preg_replace('/(?:\n|^)(={3,6})([^=]+)(\1)/e',"'<h'.strlen('$1').'>'.'$2'.'</h'.strlen('$1').'>'", $input)."\n";
  6. }
  7.  
Success #stdin #stdout 0.02s 13112KB
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stdin
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Standard input is empty
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<h3>Heading 3</h3>
<h4>Heading 4</h4>
https://ideone.com/iUEYA
language:
PHP (php 7.3.5)
created:
13 years ago
visibility:
public

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