Slightly shorter regex.

Exactly the same speed in Chrome (probably both are optimised into the same form): http://jsperf.com/number-matching
d3 · Nov 4, 2011 · 151f0ba · 151f0ba
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commit 151f0ba
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diff --git a/d3.js b/d3.js
@@ -896,7 +896,7 @@ d3.interpolateObject = function(a, b) {
   };
 }
 
-var d3_interpolate_number = /[-+]?(?:\d+\.\d+|\d+\.|\.\d+|\d+)(?:[eE][-+]?\d+)?/g,
+var d3_interpolate_number = /[-+]?(?:\d*\.?\d+)(?:[eE][-+]?\d+)?/g,
     d3_interpolate_rgb = {background: 1, fill: 1, stroke: 1};
 
 function d3_interpolateByName(n) {