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Developer-C 11.1
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create table your_table(id, name, address, doc) as select 1, '{1:mark,2:john}', '{1:Home,2:Work,3:Club}', '{NI:299,Pass:A159}' from dual union all select 2, '{1:Max,2:Mo}', '{1:Home}', '{NI:300011}' from dual
2 rows affected
select regexp_substr(name, '({|,)' || 2 || ':(.*?)(,|})', 1, 1, null, 2) as result from your_table where id = 1
RESULT
john
select regexp_substr(name, '({|,)' || 1 || ':(.*?)(,|})', 1, 1, null, 2) as result from your_table where id = 1
RESULT
mark
select regexp_substr(name, '({|,)' || 3 || ':(.*?)(,|})', 1, 1, null, 2) as result from your_table where id = 1
RESULT
null
select regexp_substr(address, '({|,)' || 3 || ':(.*?)(,|})', 1, 1, null, 2) as result from your_table where id = 1
RESULT
Club