Oracle SQL: Select specific string from CLOB field - sql

Question

I have a table where one of the fields is a CLOB, it stores a error message information.
The field CLOB as the following content:
oracle.retail.sim.common.core.SimServerException: Error processing message! [Inbound: true, MessageType: ItemLocCre, BusinessId: 1101505002]
at oracle.retail.sim.service.mps.SimMessageCommand.buildException(Unknown Source)
at oracle.retail.sim.service.mps.SimMessageProcessCommand.doExecute(Unknown Source)
at oracle.retail.sim.common.core.Command.execute(Unknown Source)
at sun.reflect.GeneratedMethodAccessor273.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
Caused by: oracle.retail.sim.common.core.SimServerException: Item not found for Id: 1101505002
at oracle.retail.sim.server.integration.consumer.itemloc.ItemLocConsumer.buildItemNotFoundException(Unknown Source)
at oracle.retail.sim.server.integration.consumer.itemloc.ItemLocCreateConsumer.handleMessage(Unknown Source)
at oracle.retail.sim.server.integration.consumer.itemloc.ItemLocCreateConsumer.handleMessage(Unknown Source)
at oracle.retail.sim.server.integration.consumer.SimMessageConsumerFactory.consume(Unknown Source)
... 56 more
Im trying to display the result of the clob directly in the PL/SQL output, so im using the following query:
select id, dbms_lob.substr(message_error, 4000, 1) AS ERROR_MESSAGE
from THE_TABLE;
What i pretend is to select only the line that contains the 'Caused by..' string. What i need is to extract only the following error message:
Item not found for Id: 1101505002
It is possible to do so whith only a select statement?
Thanks in advance,
Best regards,

Answer 1

The following query (substitute your actual table and column names) will extract one line of text, from the words Caused by to the end of that line. It doesn't matter if the line of text begins with Caused by - you will only get everything from those words to the end of the line.
If you need a shorter sub-string from that, you will need to explain in more detail how it can be "recognized" - how do you decide what can be left out and what must be returned. How is that delimited?
select regexp_substr(message, 'Caused by:.*) as caused_line
from test_data;
(Note that by default the wildcard character . does not match the end-of-line in regular expressions in Oracle.)