Clean up regexen; use common regex for numbers. Close gh-862.

src/effects.js

@@ -1,6 +1,6 @@
 var fxNow, timerId,
 	rfxtypes = /^(?:toggle|show|hide)$/,
-	rfxnum = /^(?:([\-+])=)?([\d+.\-]+)([a-z%]*)$/i,
+	rfxnum = new RegExp( "^(?:([-+])=|)(" + core_pnum + ")([a-z%]*)$", "i" ),
 	rrun = /queueHooks$/,
 	animationPrefilters = [ defaultPrefilter ],
 	tweeners = {