Regex should be "reg-ex" rather than any of the listed pronunciations since it's just short for regular expression
I think it's ambiguous whether to pronounce then abbreviate or abbreviate then pronounce. Here are some example from the Haskell world: https://h2.jaguarpaw.co.uk/posts/pronouncing-abbreviations/
`seq`, `Eq`, `prev` I pronounce like the beginnings of the underlying words, so I'd say pronounce-then-abbreviate and abbreviate-then-pronounce yield the same result.
I guess this implies people are saying "SECK" (`seq`) and "ECK" (`Eq`), rhyming `prev` with "rev", and pronouncing `id` like Freud's id? (Eek.)
In fairness, I'll confess I pronounce `enum` "E-NUM", not "E-NOOM".