229. Regex and case sensitivity, implementing ILIKE

We started learning about regular expressions by reproducing the LIKE operator and all it’s features (wildcards for a single character and for the beginning/end of text).

In this lesson let’s do the same and implement something similar to the ILIKE operator.

How can we achieve case insensitive matching with regular expressions? Here’s a virtual table for you to play with:

WITH strings AS ( SELECT 'foobar' AS string UNION SELECT 'FOOBAR' AS string UNION SELECT 'fooBAR' AS string ) SELECT string FROM strings

Think about it for a couple of minutes...

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