minor #21398 [Validator] Add option to allow ANY protocol in Assert\Url constraint (javiereguiluz)

This PR was squashed before being merged into the 7.4 branch.

Discussion
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[Validator] Add option to allow ANY protocol in Assert\Url constraint

Fixes #21397.

Commits
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49cb38b [Validator] Add option to allow ANY protocol in Assert\Url constraint

Author: javiereguiluz

reference/constraints/Url.rst

@@ -237,6 +237,21 @@ the ``ftp://`` type URLs to be valid, redefine the ``protocols`` array, listing
             }
         }
 
+The value of this option can also be an asterisk (``*``) to allow all protocols
+or a regular expression::
+
+    // allows all protocols whose names are RFC 3986 compliant
+    // (e.g. 'https://', 'git+ssh://', 'file://', 'custom://')
+    protocols: ['*']
+
+    // regular expressions are also valid
+    protocols: ['https?', 'custom.*', 'my-app-.*']
+
+.. versionadded:: 7.4
+
+    Support for ``*`` and regular expressions in the ``protocols`` option was
+    introduced in Symfony 7.4.
+
 ``relativeProtocol``
 ~~~~~~~~~~~~~~~~~~~~