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WITH ref_str AS ( SELECT '[5] www.NCCN.com' AS ref_str UNION ALL SELECT '[4] www.nhc.gov.cn' UNION ALL SELECT '[14] www.hc.gov.cn' ) SELECT SUBSTRING(SUBSTRING_INDEX(ref_str, ']', 1), 2) AS ref_id, ref_str FROM ref_str;
ref_id
ref_str
5
[5] www.NCCN.com
4
[4] www.nhc.gov.cn
14
[14] www.hc.gov.cn