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Developer-C 11.1
3.0
4.0
10.2
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10.9
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11.4
5.5
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11g Release 2
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12
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2012
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create table base( val varchar(100)); insert into base values ('55,44,1265,13,12'), ('12,55,1265,44,13'), ( 'A45, or 45A or '), (' ABCDE52JQST 1265'), ('12 13 15 or a'), ('123,212, '), ('haza12'), (1265), (1212), (12), (2012);
select val from base where val regexp '(?<![0-9])12(?![0-9])'
val
55,44,1265,13,12
12,55,1265,44,13
12 13 15 or a
haza12
12