Thanks so much for your detailed explantations.
This is a nice example for what I meant in the other thread when I said
With pretty basic [RegEx] knowledge you’ll be able to cover many common situations.
That's correct.
I will definitely investigate a bit more here as soon as I have the chance. It will take some time because a few days ago I didn't know about regex at all and also my English is not the best (to say the least) which slows down the process of understanding.
Anyway, I really appreciate your great help and explantations! Thanks again. 