Use the @bindingRegExp function directly from inside @build.

@@ -83,9 +83,8 @@
     };
 
     View.prototype.build = function() {
-      var attribute, bindingRegExp, context, keypath, node, path, pipes, type, _i, _len, _ref, _results;
+      var attribute, context, keypath, node, path, pipes, type, _i, _len, _ref, _results;
       this.bindings = [];
-      bindingRegExp = this.bindingRegExp();
       _ref = this.el.getElementsByTagName('*');
       _results = [];
       for (_i = 0, _len = _ref.length; _i < _len; _i++) {
@@ -96,8 +95,8 @@
           _results1 = [];
           for (_j = 0, _len1 = _ref1.length; _j < _len1; _j++) {
             attribute = _ref1[_j];
-            if (bindingRegExp.test(attribute.name)) {
-              type = attribute.name.replace(bindingRegExp, '');
+            if (this.bindingRegExp().test(attribute.name)) {
+              type = attribute.name.replace(this.bindingRegExp(), '');
               pipes = attribute.value.split('|').map(function(pipe) {
                 return pipe.trim();
               });

@@ -51,12 +51,10 @@ class Rivets.View
   build: =>
     @bindings = []
 
-    bindingRegExp = @bindingRegExp()
-
     for node in @el.getElementsByTagName '*'
       for attribute in node.attributes
-        if bindingRegExp.test attribute.name
-          type = attribute.name.replace bindingRegExp, ''
+        if @bindingRegExp().test attribute.name
+          type = attribute.name.replace @bindingRegExp(), ''
           pipes = attribute.value.split('|').map (pipe) -> pipe.trim()
           path = pipes.shift().split '.'
           context = @contexts[path.shift()]