Thanks everyone for the interest.
In fact I think I've probably solved my problem at that time, but then I lost my library and forgot the formula and regex also. It's been already few times in my life re-learning the regex, but we have to know when to say stop. That's partly why I bumped this dusty topic.
Thank you @davidfor for the formula, it probably doesn't work tho.
I say probably because the way how I checked this is that normally when we are typing the authors in author field and we type "&" symbol, calibre will start to give a list of suggestion for another author. This doesn't happen for ";" symbol.
I think anyway I will not make life more complicated then necessary and I will give up this idea and just convert and use for the future the "&" symbol.
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