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with tab( str ) as ( select 'Payment Due for Upcoming Course:FIN/370T 11/26/2019' from dual union all select 'Payment Due for Upcoming Course:BUS/475 11/26/2019' from dual union all select 'Payment Due for Upcoming Course:ADMIN9/475TG 11/26/2019' from dual ) select replace(regexp_substr(str,'[^:]+$'), regexp_substr(str,'[^:][^ ]+$'),'') as course_id from tab
COURSE_ID
FIN/370T
BUS/475
ADMIN9/475TG