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  1. <?php
  2.  
  3. $str = "Loreum Ipsum Dolor Sit Amet <code>Some HTML Code like <h1>Head</h1></code>. Loreum Ipsum <code>Some Code</code> Dolor Sit Amet.";
  4. '|(?s)(?<=<code>).*?(?=</code>)|',
  5. function ($matches) {
  6. return str_replace('<', '&lt;', $matches[0]);
  7. },
  8. $str
  9. );
  10. echo $str;
Success #stdin #stdout 0.02s 24728KB
stdin
Standard input is empty
stdout
Loreum Ipsum Dolor Sit Amet <code>Some HTML Code like &lt;h1>Head&lt;/h1></code>. Loreum Ipsum <code>Some Code</code> Dolor Sit Amet.