How to Extract Numeric Range from Text in SQL - regex

Question

I am fairly new to SQL and I'm trying to extract some data from an ORACLE DB. My goal is to return rows where the query value lies in the range speicified by the "AA_SYNTAX" column in a table.
For example:
If the "AA_SYNTAX" column is 'p.G12_V14insR' and my search value is 13, I want to return that row. This column is organized as p.%number_%number%. So basically I want to return the two numerical values from this column and see if my query value is between them.
I have all the tables I need joined together and everything, just not sure how to construct a query like this. I know in regex I would do something like "\d+" but im not sure how to translate this into SQL.
Thanks

Answer 1

Using Oracle, you can use Regular Expressions to extract a number from the string.
More specifically, I would look into REGEXP_SUBSTR.
Using the date given in your example above, you could use:
with cte as
(
select 'p.G12_V14insR' as AA_SYNTAX from dual
)
select
REGEXP_SUBSTR(AA_SYNTAX,'p\.[[:alpha:]]+([[:digit:]]+)', 1, 1, NULL, 1) as Bottom
,REGEXP_SUBSTR(AA_SYNTAX,'\_[[:alpha:]]+([[:digit:]]+)', 1, 1, NULL, 1) as Top
from cte
I'm sure you could clean up the Regular Expression quite a bit, but, given this, you get the value of 14 for Top and 12 for Bottom.
Hope this helps move you in the right direction.