feature #30606 [Validator] allow brackets in the optional query string (Emmanuel BORGES)

This PR was squashed before being merged into the 4.3-dev branch (closes #30606).

Discussion
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[Validator] allow brackets in the optional query string

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30603
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

Add the `allowBrackets` option from the Url constraint to allow brackets in the optional query string.

Commits
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40dc4c89df [Validator] allow brackets in the optional query string

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

@@ -35,9 +35,9 @@ class UrlValidator extends ConstraintValidator
                 \]  # an IPv6 address
             )
             (:[0-9]+)?                              # a port (optional)
-            (?:/ (?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%%[0-9A-Fa-f]{2})* )*      # a path
-            (?:\? (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )?   # a query (optional)
-            (?:\# (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )?   # a fragment (optional)
+            (?:/ (?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%%[0-9A-Fa-f]{2})* )*          # a path
+            (?:\? (?:[\pL\pN\-._\~!$&\'\[\]()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )?   # a query (optional)
+            (?:\# (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )?       # a fragment (optional)
         $~ixu';
 
     /**

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

@@ -151,6 +151,7 @@ class UrlValidatorTest extends ConstraintValidatorTestCase
             ['http://symfony.com#fragment'],
             ['http://symfony.com/#fragment'],
             ['http://symfony.com/#one_more%20test'],
+            ['http://example.com/exploit.html?hello[0]=test'],
         ];
     }