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Comments - REGEXP_SUBSTR

3 years, 6 months ago Christian Proust
Re: Capture Groups

There is one work-around. You can use \K and (?=) to look-ahead and look-behind your subject.

For example:

WITH log(X) AS (
	VALUES
	-- 'over' does not match because 'cute' does not end with a digit
	('Do you know the droid? It is over-cute <3'),
	('I think it is BB-8.'),
	-- 'BB' does not match because it is preceded by 'not'.
	('No it is not BB-8. It is R2-D2.')
)
-- Search a word preceding by 'is ' and followed by '-\\w*\\d'
SELECT REGEXP_SUBSTR(X, 'is \\K\\w+(?=-\\w*\\d)')
FROM log;
-> ''
-> 'BB'
-> 'R2'
 
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