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Perl 6 may have what you want (Score:3, Informative)
Greedy regexes are troublesome for the same reason: in the edge cases you potentially have to scan an entire input to determine where to stop reading.
Nevertheless, despite those problems, I'm confident we'll be able to permit Perl 6 input streams to use a regex as an input record separator (they'll be per-filehandle, not global, in Perl 6).
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