Missing base name

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

SQL

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

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