I believe it is not related to the version of MySQL, as I can still execute previously saved questions with regexextract expressions.
However, I am currently unable to modify existing questions with regexextract expressions or create new ones.
I have noticed a peculiar phenomenon. In the same Metabase, when I query from another database (Redshift database), the "regexextract" function works. Why is that?
I have the exact same issue, on 0.49.3 with MySQL 8.0.35 too.
I had to switch to a question written in SQL in order to be able to use REGEXP_SUBSTR (that works perfectly fine). So there's no reason we have this "Unsupported function regex-match-first" in the notebook editor when we try to use regexextract.