I suspect it's likely you won't be able to do this with a simple regex. It sounds to me like you might want to start looking at parsers, such as the classic Parse::RecDescent, the regex-based Regexp::Grammars, or the relatively new Marpa::R2. Or as a middle ground, have a look at how Text::Sentence, Lingua::Sentence, and Lingua::EN::Sentence work internally.

In reply to Re^3: How to enforce match priority irrespective of string position by haukex
in thread How to enforce match priority irrespective of string position by Polyglot

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