[10.x] Escape forward slashes when exploding wildcard rules (#48936)

* Escape forward slashes when exploding wildcard rules

Array keys with a forward slash '/' passed into the validator will cause a preg_match(): Unknown modifier exception if they are validated using a rule keyed with a wildcard '*'

This is due to the pattern being terminated early by the existence of the '/' in the pattern variable, this same fix is also used in Validator.php

* Add test

* Fix for continuous integration style

src/Illuminate/Validation/ValidationRuleParser.php

@@ -144,7 +144,7 @@ protected function prepareRule($rule, $attribute)
      */
     protected function explodeWildcardRules($results, $attribute, $rules)
     {
-        $pattern = str_replace('\*', '[^\.]*', preg_quote($attribute));
+        $pattern = str_replace('\*', '[^\.]*', preg_quote($attribute, '/'));
 
         $data = ValidationData::initializeAndGatherData($attribute, $this->data);
 

tests/Validation/ValidationRuleParserTest.php

@@ -199,6 +199,28 @@ public function testExplodeGeneratesNestedRulesForNonNestedData()
         $this->assertEquals([], $results->implicitAttributes);
     }
 
+    public function testExplodeHandlesForwardSlashesInWildcardRule()
+    {
+        $parser = (new ValidationRuleParser([
+            'redirects' => [
+                'directory/subdirectory/file' => [
+                    'directory/subdirectory/redirectedfile',
+                ],
+            ],
+        ]));
+
+        $results = $parser->explode([
+            'redirects.directory/subdirectory/file.*' => 'string',
+        ]);
+
+        $this->assertEquals([
+            'redirects.directory/subdirectory/file.0' => ['string'],
+        ], $results->rules);
+        $this->assertEquals([
+            'redirects.directory/subdirectory/file.*' => ['redirects.directory/subdirectory/file.0'],
+        ], $results->implicitAttributes);
+    }
+
     public function testExplodeHandlesArraysOfNestedRules()
     {
         $parser = (new ValidationRuleParser([