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Developer-C 11.1
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with t as ( select 'T1234, C1234, D1234, C1234' as col1 union all select 'E1234, C1234' ), cte as ( select col1, convert(varchar(max), (case when col1 like 'C%' then ', ' + left(col1, charindex(',', col1 + ',') - 1 ) else '' end)) as c_list, convert(varchar(max), stuff(col1, 1, charindex(',', col1 + ',') + 1, '')) as rest, 1 as lev from t union all select col1, c_list + (case when rest like 'C%' then ', ' + left(rest, charindex(',', rest + ',') - 1 ) else '' end) , convert(varchar(max), stuff(rest, 1, charindex(',', rest + ',') + 1, '')) as rest, lev + 1 from cte where rest > '' and lev < 10 ) select stuff(c_list, 1, 2, '') as c_list from (select cte.*, row_number() over (partition by col1 order by lev desc) as seqnum from cte ) cte where seqnum = 1
c_list
C1234
C1234, C1234