I got the commit message wrong, I'm tired. It actually removes anything starting with 2 consecutive dashes up to the end of the line.

No worries. I'll look at it properly tomorrow. Tired here as well and finishing of some other stuff that doesn't need real thinking about. 😄

All that's needed is just to remove everything after -- dashes till the end of the lines, am I right?

@innermous, Yes, is there a simpler solution?

Sec, @revolter , I'll try to figure something out. If I get a better solution, I'll let you know.

Please wait for me to test this at home with a couple of queries that don't work know before merging.

Sure.
Don't forget squash commits into one.

Here is a test of the used regex: https://regex101.com/r/O1PB9h/2

For reference, the test string set at that url is:

SELECT * -- asd ffdsf
-- saf ewf sf
-- dsaf fd
FROM    -- sfsdf
table  -- asdasd