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Answers and rating deltas for

Why doesn't this positive look-behind assertion work when anchored to the start of the string?

Author Votes Δ
Mark Byers 9 +0.47
Daniel Vandersluis 6 +0.12
Peter O'Callaghan 4 +0.19
Charles 1 -2.76
Last visited: Sep 14, 2014, 5:07:29 AM