Removing the second capture group. After the changes suggested by Jeff...

Removing the second capture group. After the changes suggested by Jeff Roberson, the second capture group is no longer needed. See
http://stackoverflow.com/questions/3771105/can-someone-tell-me-the-purpose-of-the-second-capture-group-in-the-jquery-rts-reg

src/ajax.js

@@ -7,7 +7,7 @@ var jsc = jQuery.now(),
 	rbracket = /\[\]$/,
 	jsre = /\=\?(&|$)/,
 	rquery = /\?/,
-	rts = /([?&])_=[^&]*(&?)/,
+	rts = /([?&])_=[^&]*/,
 	rurl = /^(\w+:)?\/\/([^\/?#]+)/,
 	r20 = /%20/g,
 	rhash = /#.*$/,
@@ -275,7 +275,7 @@ jQuery.extend({
 			var ts = jQuery.now();
 
 			// try replacing _= if it is there
-			var ret = s.url.replace(rts, "$1_=" + ts + "$2");
+			var ret = s.url.replace(rts, "$1_=" + ts);
 
 			// if nothing was replaced, add timestamp to the end
 			s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");