More loosely match expression function names

@@ -169,7 +169,7 @@
     // method expressions are of the form: `name([arg1, arg2, .... argn])`
     _parseMethod: function(expression) {
       // tries to match valid javascript property names
-      var m = expression.match(/([a-zA-Z_$][0-9a-zA-Z_$]*)\((.*)\)/);
+      var m = expression.match(/([^\s]+)\((.*)\)/);
       if (m) {
         var sig = { method: m[1], static: true };
         if (m[2].trim()) {