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Answers and rating deltas for

I don't understand "?!" in regex

Author Votes Δ
w.b 1 +0.53
Evan VanderZee 0 -1.12
Jeremy Jones 0 -1.08
Neal 0 -1.10
Buzz 0 -0.97
Last visited: Jan 3, 2016, 9:42:40 AM