尝试使用REGEXP_SUBSTR时出现错误（PLS-00201）

Question

I am new at PL SQL and ran into a problem when trying to use REGEXP_SUBSTR in a SQL Procedure. I have a String when is a single line from a file and I am trying to isolate one element of that line lik so

 "batch_number := REGEXP_SUBSTR(lv_f_line, '[^,]+', 1, 1);"

The error I get is:

 "Error(124,25): PLS-00201: identifier 'REGEXP_SUBSTR' must be declared"

Now I undserstand that this is a common error but why on REGEXP_SUBSTR which is not an identifier? I have looked around for an answer and I just cannot find anything. Can anyone shed some light please?

Many thanks, K.

Answer 1

REGEXP_SUBSTR is an SQL function. It may not be available in PL/SQL.

Try something like

SELECT REGEXP_SUBSTR(lv_f_line, '[^,]+', 1, 1)
into batch_number
from dual;

That's not too efficiecnt because of context switching but may work if you don't execute it many times