Extract string data between specific points in Oracle SQL

Question

Example of Text:

PROCEDURE:                          Cryo balloon antral pulmonary vein
isolation and cavotricuspid isthmus ablation.

The patient is a middle aged and happy.

I am trying to extract "Cryo balloon antral pulmonary vein isolation and cavotricuspid isthmus ablation" from the text.

The Code I used: TRIM(REGEXP_SUBSTR(a.Document_Text, 'Procedure:\s*(.*)\s*?\.',1,1,'inm',1)) as Text_Procedure_DESC

But what I get is the whole note after 'Procedure:'

FYI:

There are text fields Prior to and after the Procedure entry.
There are multiple spaces and vary from note to note.

Not sure where I messed up!

MT0 · Accepted Answer · 2022-07-11 18:22:43Z

1

You want to make the .* pattern non-greedy by using .*?
The m option is redundant (as you are not matching the start or end of lines)
and you don't need the TRIM function.

Like this:

SELECT REGEXP_SUBSTR(document_text, 'PROCEDURE:\s+(.*?)\.', 1, 1, 'in' , 1)
         AS Text_Procedure_DESC
FROM   table_name;

Which, for the sample data:

CREATE TABLE table_name (value) AS
SELECT 'PROCEDURE:                          Cryo balloon antral pulmonary vein
isolation and cavotricuspid isthmus ablation.

The patient is a middle aged and happy.' FROM DUAL

Outputs:

TEXT_PROCEDURE_DESC

Cryo balloon antral pulmonary vein
isolation and cavotricuspid isthmus ablation

db<>fiddle here

edited Jul 11, 2022 at 18:22

answered Jul 11, 2022 at 18:10

MT0

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