bug #15127 [Validator] fix validation for Maestro UK card numbers (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Validator] fix validation for Maestro UK card numbers

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #15085
| License       | MIT
| Doc PR        |

The issue with the fix in #15086 was, that the `[56-69]` part of the regular expression did not cover the numbers from 56 to 69 but only matched one number if it was 5, 6 or 9 which means that the regular expression itself was not only invalid, but also covered only a total maximum length of 18 digits.

Commits
-------

f24532a fix validation for Maestro UK card numbers

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

@@ -67,7 +67,8 @@ class CardSchemeValidator extends ConstraintValidator
         'MAESTRO' => array(
             '/^(6759[0-9]{2})[0-9]{6,13}$/',
             '/^(50[0-9]{4})[0-9]{6,13}$/',
-            '/^([56-69][0-9]{4})[0-9]{6,13}$/',
+            '/^5[6-9][0-9]{10,17}$/',
+            '/^6[0-9]{11,18}$/',
         ),
         // All MasterCard numbers start with the numbers 51 through 55. All have 16 digits.
         'MASTERCARD' => array(

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

@@ -90,8 +90,10 @@ class CardSchemeValidatorTest extends AbstractConstraintValidatorTest
             array('LASER', '6771656738314582216'),
             array('MAESTRO', '6759744069209'),
             array('MAESTRO', '5020507657408074712'),
+            array('MAESTRO', '5612559223580173965'),
             array('MAESTRO', '6759744069209'),
             array('MAESTRO', '6759744069209'),
+            array('MAESTRO', '6594371785970435599'),
             array('MASTERCARD', '5555555555554444'),
             array('MASTERCARD', '5105105105105100'),
             array('VISA', '4111111111111111'),