fix(input): modify email validation regexp to match rfc1035

Previously, domain parts which began with or ended with a dash, would be accepted as valid. This CL matches Angular's email validation with that of Chromium and Firefox.

Closes #6026

Author: KevinBrogan

src/ng/directive/input.js

@@ -9,7 +9,7 @@
 */
 
 var URL_REGEXP = /^(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?$/;
-var EMAIL_REGEXP = /^[a-z0-9!#$%&'*+\/=?^_`{|}~.-]+@[a-z0-9-]+(\.[a-z0-9-]+)*$/i;
+var EMAIL_REGEXP = /^[a-z0-9!#$%&'*+/=?^_`{|}~.-]+@[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/i;
 var NUMBER_REGEXP = /^\s*(\-|\+)?(\d+|(\d*(\.\d*)))\s*$/;
 
 var inputType = {

test/ng/directive/inputSpec.js

@@ -1019,6 +1019,10 @@ describe('input', function() {
         expect(EMAIL_REGEXP.test('a@b.museum')).toBe(true);
         expect(EMAIL_REGEXP.test('a@B.c')).toBe(true);
         expect(EMAIL_REGEXP.test('a@.b.c')).toBe(false);
+        expect(EMAIL_REGEXP.test('a@-b.c')).toBe(false);
+        expect(EMAIL_REGEXP.test('a@b-.c')).toBe(false);
+        expect(EMAIL_REGEXP.test('a@3b.c')).toBe(true);
+        expect(EMAIL_REGEXP.test('a@b')).toBe(true);
       });
     });
   });