Handle capitalized route parameters with Route::localizedUrl()

src/LocalizedUrlGenerator.php

@@ -306,7 +306,7 @@ protected function updateLocaleInSlugs(array $slugs, $locale)
      */
     protected function extractQueryParameters($uri, $parameters)
     {
-        preg_match_all('/{([a-z_.-]+\??)}/', $uri, $matches);
+        preg_match_all('/{([a-zA-Z_.-]+\??)}/', $uri, $matches);
         $paramKeys = $matches[1] ?? [];
 
         $slugs = [];
@@ -347,7 +347,7 @@ protected function replaceParameters($uri, $parameters)
             $uri = str_replace($placeholder, $value, $uri);
         }
 
-        $uri = preg_replace('/{[a-z_.-]+\?}/', '', $uri);
+        $uri = preg_replace('/{[a-zA-Z_.-]+\?}/', '', $uri);
 
         return $uri;
     }

tests/Unit/Macros/LocalizedUrlMacroTest.php

@@ -771,6 +771,30 @@ public function it_allows_optional_parameters_with_unnamed_routes()
         ], $response->original);
     }
 
+    /** @test */
+    public function it_handles_capitalized_parameter_names()
+    {
+        $this->withoutExceptionHandling();
+        $this->setSupportedLocales(['en', 'nl']);
+
+        Route::get('route/{slugWithCaps}/{optionalSlugWithCaps?}', function () {
+            return [
+                'current' => Route::localizedUrl(null, ['another-slug']),
+                'en' => Route::localizedUrl('en', ['another-slug']),
+                'nl' => Route::localizedUrl('nl', ['another-slug']),
+            ];
+        });
+
+        $response = $this->call('GET', '/route/some-slug');
+        $response->assertOk();
+        $this->assertEquals([
+            'current' => url('/route/another-slug'),
+            'en' => url('/route/another-slug'),
+            'nl' => url('/route/another-slug'),
+        ], $response->original);
+
+    }
+
     /** @test */
     public function it_returns_a_url_with_translated_slugs_for_named_routes()
     {