postgresql - Populate column with content from another column -


i have table in postgres 1 field (group_id) missing older records. however, field consist of urls , 1 part of url group_id. following substring extracts group_id

"substring"(my_table.url, '.*app/([^/]*)'::text)

how replace missing records these?

begin; update my_table set group_id = "substring"(my_table.url, '.*app/([^/]*)'::text); commit;

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