Oracle SQL Developer regex expression error

Question

In the script file, I inserted the following code.

drop table Test;
create table Test(
name char(2) unique not null,
constraint name_c check(
regexp_like(name, '^[A-Z]{1,2}$', 'c')
)
);

insert into Test values ('B');

The developer never budge. It keeps on saying violating the name_c constraint and I don't understand why. The regular expression looks fine for me.

Some variants, however, succeeded, for example, dropping the dollar sign

drop table Test;
create table Test(
name char(2) unique not null,
constraint name_c check(
regexp_like(name, '^[A-Z]{1,2}', 'c')
)
);

insert into Test values ('B');

And I don't understand either.

Why?

Edit: This is the problem: logically the regex is right. But somehow Oracle SQL Developer doesn't budge.

Answer 1

如果您以 1 或 2 个大写字母开头，并且接下来的内容无关紧要，您应该这样做：

^[A-Z]{1,2}.*

.* mean 1 or more character exept \n (nex line)