Fix due to #40 (comment)

Author: wol-soft

src/PropertyProcessor/Property/StringProcessor.php

@@ -58,7 +58,7 @@ protected function addPatternValidator(PropertyInterface $property, JsonSchema $
             return;
         }
 
-        $escapedPattern = addcslashes(str_replace('\\\\', '\\\\\\\\', $json[static::JSON_FIELD_PATTERN]), '/');
+        $escapedPattern = addcslashes($json[static::JSON_FIELD_PATTERN], '/');
 
         if (@preg_match("/$escapedPattern/", '') === false) {
             throw new SchemaException(

tests/Objects/StringPropertyTest.php

@@ -189,7 +189,12 @@ public function testPatternMatchingStringIsValid(
         string $pattern,
         ?string $propertyValue
     ): void {
-        $className = $this->generateClassFromFileTemplate('StringPropertyPattern.json', [$pattern], $configuration, false);
+        $className = $this->generateClassFromFileTemplate(
+            'StringPropertyPattern.json',
+            [$pattern],
+            $configuration,
+            false
+        );
 
         $object = new $className(['property' => $propertyValue]);
         $this->assertSame($propertyValue, $object->getProperty());
@@ -216,7 +221,7 @@ public function validPatternProvider(): array
                     '[0-9]{4}-[0-9]{2}-[0-9]{2}',
                     'Contains a Date 2018-12-12 and something else'
                 ],
-                'Regex escape test' => ['^\\\\\\\\/\'$', '\\\\/\''],
+                'Regex escape test' => ['^\\\\\\\\/\'$', '\\/\''],
             ]
         );
     }