Thanks, Anonymous Monk ...
The regex debug output does indeed provide lots of feedback ... a look right into the inner workings of the regex engine. I have to admit, however, I am not sure how this information contributes to solving my initial problem - apart, maybe, from the fact that it only contains one Compiling RExstatement statement - contrary to my initial belief that the regex would get compiled anew on each loop-iteration.
Let me know if I am overlooking anything here:
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