Fix invalid BSON regex flags in DatabasePresenceVerifier::getCount()

src/Validation/DatabasePresenceVerifier.php

@@ -17,7 +17,7 @@ class DatabasePresenceVerifier extends \Illuminate\Validation\DatabasePresenceVe
     #[Override]
     public function getCount($collection, $column, $value, $excludeId = null, $idColumn = null, array $extra = [])
     {
-        $query = $this->table($collection)->where($column, new Regex('^' . preg_quote($value) . '$', '/i'));
+        $query = $this->table($collection)->where($column, new Regex('^' . preg_quote($value) . '$', 'i'));
 
         if ($excludeId !== null && $excludeId !== 'NULL') {
             $query->where($idColumn ?: 'id', '<>', $excludeId);

tests/ValidationTest.php

@@ -5,7 +5,9 @@
 namespace MongoDB\Laravel\Tests;
 
 use Illuminate\Support\Facades\Validator;
+use MongoDB\BSON\Regex;
 use MongoDB\Laravel\Tests\Models\User;
+use MongoDB\Laravel\Validation\DatabasePresenceVerifier;
 
 class ValidationTest extends TestCase
 {
@@ -132,4 +134,44 @@ public function testExists(): void
         );
         $this->assertFalse($validator->fails());
     }
+
+    public function testGetCountBuildsRegexWithValidFlags(): void
+    {
+        $query = new class {
+            public $value;
+
+            public function useWritePdo()
+            {
+                return $this;
+            }
+
+            public function where($column, $value)
+            {
+                $this->value = $value;
+
+                return $this;
+            }
+
+            public function count()
+            {
+                return 0;
+            }
+        };
+
+        $verifier = new class ($query) extends DatabasePresenceVerifier {
+            public function __construct(private $query)
+            {
+            }
+
+            protected function table($table)
+            {
+                return $this->query;
+            }
+        };
+
+        $verifier->getCount('users', 'name', 'John Doe');
+
+        $this->assertInstanceOf(Regex::class, $query->value);
+        $this->assertSame('i', $query->value->getFlags());
+    }
 }