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  1. <?php
  2.  
  3. $re = '~(?:<figcaption|(?!^)\G)[^<#]*(?:(?:<(?!\/figcaption>)|#\B)[^<#]*)*\K#\w+~'; 
  4. $str = "<figcaption>blah # blah #hashtag1, #hashtag2</figcaption> #ee <figcaption>#ddddd"; 
  5. $subst = "<span class=\"highlight\">$0</span>"; 
  6. $result = preg_replace($re, $subst, $str);
  7. echo $result;
Success #stdin #stdout 0.02s 52472KB
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Standard input is empty
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<figcaption>blah # blah <span class="highlight">#hashtag1</span>, <span class="highlight">#hashtag2</span></figcaption> #ee <figcaption><span class="highlight">#ddddd</span>
https://ideone.com/fO2F7P
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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