Thank you Francisco.
In fact, I am already solving part of the problem in my application -
fetching from the DB the records matching the source pattern and then
filtering them in the application's memory by matching against the target
pattern, with the references replaced (it's a breeze in C#).
It works very vell. However, I am not completely satisfied with i as it's
unnecessarily loading larger data set than it absolutely must. Besides, I'd
also like to get some experience in DB programming. That's why the PL/Perl
way seems pretty attractive to me.
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