diff --git a/CHANGELOG.md b/CHANGELOG.md
index 185954a1..0ba97445 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ Latest
 * [#194](https://github.com/cleverage/process-bundle/issues/194) Fix ProcessLauncherTask: the `process_options` normalizer returned an array despite its scalar return type, so the task always failed with a `TypeError`. Update documentation, add tests.
 * [#189](https://github.com/cleverage/process-bundle/issues/189) Fix EventDispatcherTask: dispatch the event under the `event_name` option (regression since v4.0). `event_name` is now optional: when `null` (default), the event is dispatched under its class name. Update documentation, add tests.
 * [#198](https://github.com/cleverage/process-bundle/issues/198) Fix DateParserTransformer: a `\DateTimeImmutable` input is converted to a `\DateTime` instead of throwing a `TypeError`. Update documentation, add tests.
+* [#199](https://github.com/cleverage/process-bundle/issues/199) Fix PregFilterTransformer: an array `replacement` is no longer cast to the string `"Array"`, and requires an array `pattern`. Update documentation, add tests.
 
 ## Deprecated
 * [#189](https://github.com/cleverage/process-bundle/issues/189) EventDispatcherTask: when `event_name` is set, listening to `CleverAge\ProcessBundle\Event\EventDispatcherTaskEvent` is deprecated (the event is still dispatched under its class name, with an `E_USER_DEPRECATED` error, if it has listeners). Listen to the configured `event_name` instead: the BC layer will be removed in v6.0.
diff --git a/docs/reference/transformers/preg_filter_transformer.md b/docs/reference/transformers/preg_filter_transformer.md
index 29a7f70a..90984880 100644
--- a/docs/reference/transformers/preg_filter_transformer.md
+++ b/docs/reference/transformers/preg_filter_transformer.md
@@ -27,7 +27,7 @@ Options
 | Code          | Type            | Required | Default | Description                                                                                           |
 |---------------|-----------------|:--------:|---------|-------------------------------------------------------------------------------------------------------|
 | `pattern`     | `string\|array` |  **X**   |         | Pattern, or list of patterns, to search                                                               |
-| `replacement` | `string\|array` |  **X**   |         | Replacement string. The value is cast to string, so an array is not supported in practice (see Notes) |
+| `replacement` | `string\|array` |  **X**   |         | Replacement string, or list of replacements (only when `pattern` is an array)                         |
 
 Examples
 --------
@@ -39,6 +39,15 @@ preg_filter:
   replacement: ''
 ```
 
+* Replace several patterns at once: each pattern is replaced by the replacement at the same position
+
+```yaml
+# Transformer options level
+preg_filter:
+  pattern: ['/a/', '/b/']
+  replacement: ['1', '2']
+```
+
 * Reformat a date, `null` if the input does not match
 
 ```yaml
@@ -51,5 +60,6 @@ preg_filter:
 Notes
 -----
 
-Although `replacement` accepts an `array`, it is cast to string before calling `preg_filter()`, which results in the
-literal `Array` (and a PHP warning).
+An array `replacement` requires an array `pattern` (as in `preg_filter()`): otherwise an `InvalidOptionsException` is
+thrown when resolving the options. If `replacement` has fewer elements than `pattern`, the missing replacements are
+empty strings.
diff --git a/src/Transformer/PregFilterTransformer.php b/src/Transformer/PregFilterTransformer.php
index 361dd119..7b046878 100644
--- a/src/Transformer/PregFilterTransformer.php
+++ b/src/Transformer/PregFilterTransformer.php
@@ -13,6 +13,8 @@
 
 namespace CleverAge\ProcessBundle\Transformer;
 
+use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
+use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class PregFilterTransformer implements ConfigurableTransformerInterface
@@ -22,7 +24,7 @@ public function transform(mixed $value, array $options = []): array|string|null
         $pattern = $options['pattern'];
         $replacement = $options['replacement'];
 
-        return preg_filter($pattern, (string) $replacement, (string) $value);
+        return preg_filter($pattern, $replacement, (string) $value);
     }
 
     /**
@@ -38,5 +40,15 @@ public function configureOptions(OptionsResolver $resolver): void
         $resolver->setRequired(['pattern', 'replacement']);
         $resolver->setAllowedTypes('pattern', ['string', 'array']);
         $resolver->setAllowedTypes('replacement', ['string', 'array']);
+        $resolver->setNormalizer(
+            'replacement',
+            static function (Options $options, string|array $value): string|array {
+                if (\is_array($value) && !\is_array($options['pattern'])) {
+                    throw new InvalidOptionsException('The "replacement" option can only be an array when the "pattern" option is an array');
+                }
+
+                return $value;
+            }
+        );
     }
 }
diff --git a/tests/Transformer/PregFilterTransformerTest.php b/tests/Transformer/PregFilterTransformerTest.php
new file mode 100644
index 00000000..746f5dc9
--- /dev/null
+++ b/tests/Transformer/PregFilterTransformerTest.php
@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the CleverAge/ProcessBundle package.
+ *
+ * Copyright (c) Clever-Age
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CleverAge\ProcessBundle\Tests\Transformer;
+
+use CleverAge\ProcessBundle\Transformer\PregFilterTransformer;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+#[\PHPUnit\Framework\Attributes\CoversClass(PregFilterTransformer::class)]
+#[\PHPUnit\Framework\Attributes\CoversMethod(PregFilterTransformer::class, 'transform')]
+#[\PHPUnit\Framework\Attributes\CoversMethod(PregFilterTransformer::class, 'configureOptions')]
+#[\PHPUnit\Framework\Attributes\CoversMethod(PregFilterTransformer::class, 'getCode')]
+class PregFilterTransformerTest extends TestCase
+{
+    public function testTransformWithStringReplacement(): void
+    {
+        $transformer = new PregFilterTransformer();
+        $options = $this->resolveOptions($transformer, [
+            'pattern' => '/^(\d{2})\/(\d{2})\/(\d{4})$/',
+            'replacement' => '$3-$2-$1',
+        ]);
+
+        $this->assertSame('2019-12-02', $transformer->transform('02/12/2019', $options));
+    }
+
+    public function testTransformReturnsNullWhenPatternDoesNotMatch(): void
+    {
+        $transformer = new PregFilterTransformer();
+        $options = $this->resolveOptions($transformer, [
+            'pattern' => '/^\d+$/',
+            'replacement' => 'number',
+        ]);
+
+        $this->assertNull($transformer->transform('abc', $options));
+    }
+
+    public function testTransformWithArrayReplacement(): void
+    {
+        $transformer = new PregFilterTransformer();
+        $options = $this->resolveOptions($transformer, [
+            'pattern' => ['/a/', '/b/'],
+            'replacement' => ['1', '2'],
+        ]);
+
+        $this->assertSame('12c', $transformer->transform('abc', $options));
+    }
+
+    public function testArrayReplacementRequiresArrayPattern(): void
+    {
+        $transformer = new PregFilterTransformer();
+
+        $this->expectException(InvalidOptionsException::class);
+
+        $this->resolveOptions($transformer, [
+            'pattern' => '/a/',
+            'replacement' => ['1', '2'],
+        ]);
+    }
+
+    public function testGetCode(): void
+    {
+        $this->assertSame('preg_filter', (new PregFilterTransformer())->getCode());
+    }
+
+    /**
+     * @param array<string, mixed> $options
+     *
+     * @return array<string, mixed>
+     */
+    private function resolveOptions(PregFilterTransformer $transformer, array $options): array
+    {
+        $resolver = new OptionsResolver();
+        $transformer->configureOptions($resolver);
+
+        return $resolver->resolve($options);
+    }
+}