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  1. <?php
  2.  
  3. $re = "#][^\[\]]*(*SKIP)(*F)|<\/?[a-z].*?>#si"; 
  4. $str = "[<span style=\"font-size: 12.1599998474121px; line-height: 15.8079996109009px;\">heading </span>heading=\"h1\"]Its a <span style=\"text-decoration: line-through;\">subject</span>.[/<span style=\"font-size: 12.1599998474121px; line-height: 15.8079996109009px;\">heading</span>]"; 
  5. $result = preg_replace($re, '', $str);
  6. echo $result;
Success #stdin #stdout 0.02s 24144KB
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[heading heading="h1"]Its a <span style="text-decoration: line-through;">subject</span>.[/heading]
https://ideone.com/ZUroHn
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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