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  1. <?php
  2. 	$page = " <p>
  3.      string
  4.     <b>
  5.       bold
  6.     </b>
  7.         <em>italic string</em>
  8.       also(bold)
  9.     </b>
  10.  </p>";
  11.  
  12. $res1 = preg_replace('~^(\s*<(?!/))([^<]+)>(?=[^<]+\n)((?:(?!</\2>)[\s\S])*?)(?=\n *<)(?![^>]*</\2>)~m', "$1$2>$3\n$1/$2>", $page);
  13. $res2 = preg_replace('~/[^>]+>$\n\K([^<>]*?)(^\s*)(?=</([^>]+)>)~m', "$2<$3>\n$1$2", $res1);
  14.  
  15. echo $res2;
  16.  
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin 
Standard input is empty
stdout 
 <p>
     string
 </p>
    <b>
      bold
    </b>
        <em>italic string</em>
    <b>
      also(bold)
    </b>
 <p>
 </p>
https://ideone.com/cF46l2
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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