For an example, please see my old node The story of a strange line of code: pos($_) = pos($_); where I deliberately want to do that. It happens because to make the code more readable, I'm not matching one big regex with a lot of alternation, but multiple regexes one after another, and more than one of those can match the empty string at the same position.

In reply to Re^2: Is there a way to allow consecutive zero-length matches without using pos()? by ambrus
in thread Is there a way to allow consecutive zero-length matches without using pos()? by jsm

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