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WITH cteData AS (SELECT 'select' AS QUERY_STR FROM DUAL UNION ALL SELECT 'column1 c1,' AS QUERY_STR FROM DUAL UNION ALL SELECT 'column2 c2' AS QUERY_STR FROM DUAL UNION ALL SELECT 'from tmp_123 foo1, -- some comments here' AS QUERY_STR FROM DUAL UNION ALL SELECT 'TAB1_123 TAB1' AS QUERY_STR FROM DUAL UNION ALL SELECT 'where 1=1' AS QUERY_STR FROM DUAL UNION ALL SELECT ';' AS QUERY_STR FROM DUAL) select regexp_substr(query_str, 'TMP_[A-z]+', 1, 1, 'i') AS MATCH FROM cteData WHERE regexp_substr(query_str, 'TMP_[A-z]+', 1, 1, 'i') IS NOT NULL
MATCH
tmp_123 foo1, -- some comments here