Missing base name

This query is marked as a draft This query has been published by EqJjgOa8rVvsRmZL.

SQL

select count(*) from page
where page_namespace = 0 and page_is_redirect = 0
and page_title rlike '\_\\(.*\\)|,\_'
and regexp_substr(page_title, ".*?(?=\_\\(.*\\)|,\_)") not in (
  select page_title from page where page_namespace = 0
)
group by regexp_substr(page_title, ".*?(?=\_\\(.*\\)|,\_)")
having count(page_title) = 1
-- order by topics desc
limit 1

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