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Backreference

Is there a way to use Backreference (e.g. (.)\1 )? Uziel302 (talk) 20:21, 27 July 2020 (UTC)[reply]

@Uziel302: No, that's not supported; \1 just matches a literal "1". For example, try this search. -- John of Reading (talk) 21:09, 27 July 2020 (UTC)[reply]

John of Reading, that's why I asked, and couldn't find on which level it is, mediawiki/elastic/lucene. Uziel302 (talk) 12:35, 28 July 2020 (UTC)[reply]

Me would like to see reference for the no-support status (it may be supported with a different syntax), rather than another non-working example, too. —Mykhal (talk) 10:03, 5 October 2020 (UTC)[reply]