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PG library checks the name
2022-04-23 13:41:00 【Wangcai 2】
select coalesce(SUBSTRING(xm, '^([\u4e00-\u9fa5]{1,20}|([\u4e00-\u9fa5]{1,20}·[\u4e00-\u9fa5]{1,20}))$'),'111') ;
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