DOI prefixes - Quarry

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

SQL

USE enwiki_p;
SELECT REGEXP_SUBSTR(el_to, '(?<=\\/\\/doi.org\\/10\\.)[[:digit:]]{4,}') as prefix, count(*)
FROM externallinks
WHERE el_to RLIKE 'doi.org\\/10\\.'
GROUP BY prefix

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