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  1. <?php
  2.  
  3. $s = '<sup>1, 2, 3- 124</sup>';
  4. echo preg_replace_callback('~<sup>[^<]*</sup>~', function ($m) {
  5. 	return preg_replace('~\d+~', '{{{$0}}}', $m[0]);
  6. }, $s);
Success #stdin #stdout 0.01s 52488KB
comments (?)
stdin 
Standard input is empty
stdout 
<sup>{{{1}}}, {{{2}}}, {{{3}}}- {{{124}}}</sup>
https://ideone.com/Sy1LPu
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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