[Solved] Perl Regex – Search and replace between tags only if string is in-between [closed]

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To get the closest starting tag to ThisIsImportant use a negative
assertion on the tag itself.

/<tag>(?:(?!<tag>).)*ThisIsImportant.*?<\/tag>/

Formatted: 

 <tag>
 (?:
      (?! <tag> )
      . 
 )*
 ThisIsImportant
 .*? 
 </tag>

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solved Perl Regex – Search and replace between tags only if string is in-between [closed]