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Answers and rating deltas for

How would I change this regular expression to accept a single decimal of .5 at the end?

Author Votes Δ
Steve Summit 3 +4.82
Brad Christie 2 +0.86
T.D. Smith 1 -1.59
Andrew Whitaker 1 -1.21
Last visited: Nov 11, 2015, 8:19:14 AM