Username and password in basic auth are allowed to contain '.'

Initially reported by Fede Isas in https://github.com/beberlei/assert/pull/234

src/Symfony/Component/Validator/Constraints/UrlValidator.php

@@ -24,7 +24,7 @@ class UrlValidator extends ConstraintValidator
 {
     const PATTERN = '~^
             (%s)://                                 # protocol
-            (([\pL\pN-]+:)?([\pL\pN-]+)@)?          # basic auth
+            (([\.\pL\pN-]+:)?([\.\pL\pN-]+)@)?      # basic auth
             (
                 ([\pL\pN\pS-\.])+(\.?([\pL]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
                     |                                              # or

src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php

@@ -103,6 +103,9 @@ class UrlValidatorTest extends AbstractConstraintValidatorTest
             array('http://xn--d1abbgf6aiiy.xn--p1ai/'),
             array('http://☎.com/'),
             array('http://username:password@symfony.com'),
+            array('http://user.name:password@symfony.com'),
+            array('http://username:pass.word@symfony.com'),
+            array('http://user.name:pass.word@symfony.com'),
             array('http://user-name@symfony.com'),
         );
     }