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create table t0 ( tt varchar(3000) not null, CHECK(tt REGEXP '^[a-z]\.[a-z]$') ); create table t1 ( tt varchar(3000) not null, CHECK(tt REGEXP '^[a-z]\\.[a-z]$') ); insert into t0 values ('a.c'), ('abc'); insert into t1 values ('a.c'), ('abc');

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