Interesting. I'd never heard of Regexp::Assemble...
From the doc: 
It is also possible to track the original patterns,
so that you can determine which, among the source patterns
that form the assembled pattern, was the one that caused
the match to occur.

In reply to Re^2: line by line match on an array of strings by bibliophile
in thread line by line match on an array of strings by barryscott

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