Fixes #8054 by reverting feature enhancement 5812 (4920). Regexps no longer searches for %3F in url or data to find jsonp callback placeholders.

src/ajax/jsonp.js

@@ -1,7 +1,7 @@
 (function( jQuery ) {
 
 var jsc = jQuery.now(),
-	jsre = /(\=)(?:\?|%3F)(&|$)|()(?:\?\?|%3F%3F)()/i;
+	jsre = /(\=)\?(&|$)|()\?\?()/i;
 
 // Default jsonp settings
 jQuery.ajaxSetup({

test/unit/ajax.js

@@ -1199,10 +1199,10 @@ test("jQuery.getScript(String, Function) - no callback", function() {
 jQuery.each( [ "Same Domain", "Cross Domain" ] , function( crossDomain , label ) {
 
 	test("jQuery.ajax() - JSONP, " + label, function() {
-		expect(17);
+		expect(16);
 
 		var count = 0;
-		function plus(){ if ( ++count == 17 ) start(); }
+		function plus(){ if ( ++count == 16 ) start(); }
 
 		stop();
 
@@ -1306,23 +1306,6 @@ jQuery.each( [ "Same Domain", "Cross Domain" ] , function( crossDomain , label )
 			}
 		});
 
-		jQuery.ajax({
-			url: "data/jsonp.php",
-			dataType: "jsonp",
-			crossDomain: crossDomain,
-			data: {
-				callback: "?"
-			},
-			success: function(data){
-				ok( data.data, "JSON results returned (GET, processed data callback)" );
-				plus();
-			},
-			error: function(data){
-				ok( false, "Ajax error JSON (GET, processed data callback)" );
-				plus();
-			}
-		});
-
 		jQuery.ajax({
 			url: "data/jsonp.php",
 			dataType: "jsonp",