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No wonder you seemed to get angry with me yesterday,

If I came across as angry, I apologize.
That is not my nature. I was just trying to help you understand it can be more complex than it appears.

Good luck with your work, glad to see you making progress.

POSIX or non-Posix makes differences in when certain Regex characters have to be escaped with a \.

In at least 99% of my use cases, I end up with less \ characters if I use POSIX syntax, that's why I always have it enabled.