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Regex for CirrusSearch
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It appears that regular expressions aren't enabled on Miraheze, since:

  • Searching for something like insource:"comment added by" insource:/comment added by/ on Miraheze Meta and the Rainverse Wiki says "An error has occurred while searching: Query was not understood. Please make it simpler. The query was logged to improve the search system."
  • LocalSettings.php does not mention $wgCirrusSearchWikimediaExtraPlugin, a variable used for configuring regex per the extension's documentation page

Is this something that no one has ever asked for, or is it not enabled due to potential ReDoS?