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So the opened question is, which is better: should lenghtPattern subsume separator or should it specify the pattern the field may match?
Note: changing the code to support pattern is delimiter would not be that much work so time to implement should not be a consideration.
I have made the necessary local changes to reverse the logic to make it a search by regex delimiter and still find the AO000, AO001, AO002, AO003, AO004, AV000, AV001 and AV002 tests are still failing due to an inability of the parser to find the initiator property.