in reply to Re^4: Modifying the match position after each match
in thread Modifying the match position after each match

You could be right, it isn't entirely clear.

I based my interpretation of the spec on the post above where he says:

b) I only know that the end of the string has been reached when the next underscore is reached.

And the fact that in all his examples, the strings do end with underscore.

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