fix(ngInput): change URL_REGEXP to better match RFC3987

The URL_REGEXP in use to perform validation in ngInput is too restrictive and fails to
follow RFC3987. In particular, it only accepts ftp, http, and https scheme components and
rejects perfectly valid schemes such as "file", "mailto", "chrome-extension",
etc. The regex also requires the scheme to be followed by two "/" but the RFC says
0 to n are acceptable. This change fixes both of these issues to better align to
the standard.

Closes angular#11341
Closes angular#11381

src/ng/directive/input.js

@@ -11,7 +11,8 @@
 
 // Regex code is obtained from SO: https://stackoverflow.com/questions/3143070/javascript-regex-iso-datetime#answer-3143231
 var ISO_DATE_REGEXP = /\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d+([+-][0-2]\d:[0-5]\d|Z)/;
-var URL_REGEXP = /^(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?$/;
+// See valid URLs in RFC3987 (http://tools.ietf.org/html/rfc3987)
+var URL_REGEXP = /^[A-Za-z][A-Za-z\d.+-]*:\/*(?:\w+(?::\w+)?@)?[^\s/]+(?::\d+)?(?:\/[\w#!:.?+=&%@\-/]*)?$/;
 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*)))([eE][+-]?\d+)?\s*$/;
 var DATE_REGEXP = /^(\d{4})-(\d{2})-(\d{2})$/;

test/ng/directive/inputSpec.js

@@ -2537,8 +2537,18 @@ describe('input', function() {
     describe('URL_REGEXP', function() {
       /* global URL_REGEXP: false */
       it('should validate url', function() {
+        // See valid URLs in RFC3987 (http://tools.ietf.org/html/rfc3987)
         expect(URL_REGEXP.test('http://server:123/path')).toBe(true);
+        expect(URL_REGEXP.test('https://server:123/path')).toBe(true);
+        expect(URL_REGEXP.test('file:///home/user')).toBe(true);
+        expect(URL_REGEXP.test('mailto:[email protected]?subject=Foo')).toBe(true);
+        expect(URL_REGEXP.test('r2-d2.c3-p0://localhost/foo')).toBe(true);
+        expect(URL_REGEXP.test('abc:/foo')).toBe(true);
+        expect(URL_REGEXP.test('http:')).toBe(false);
         expect(URL_REGEXP.test('[email protected]')).toBe(false);
+        expect(URL_REGEXP.test('a_B.c')).toBe(false);
+        expect(URL_REGEXP.test('0scheme://example.com')).toBe(false);
+        expect(URL_REGEXP.test('http://example.com:9999/~~``')).toBe(false);
       });
     });
   });