diff --git a/src/Model/Validator/PatternPropertiesValidator.php b/src/Model/Validator/PatternPropertiesValidator.php
index 9a065c4..470b6ef 100644
--- a/src/Model/Validator/PatternPropertiesValidator.php
+++ b/src/Model/Validator/PatternPropertiesValidator.php
@@ -64,7 +64,7 @@ public function __construct(
             DIRECTORY_SEPARATOR . 'Validator' . DIRECTORY_SEPARATOR . 'PatternProperties.phptpl',
             [
                 'patternHash' => $this->key,
-                'pattern' => "/{$this->pattern}/",
+                'pattern' => base64_encode('/' . addcslashes($this->pattern, '/') . '/'),
                 'validationProperty' => $this->validationProperty,
                 'generatorConfiguration' => $schemaProcessor->getGeneratorConfiguration(),
                 'viewHelper' => new RenderHelper($schemaProcessor->getGeneratorConfiguration()),
diff --git a/src/PropertyProcessor/Property/BaseProcessor.php b/src/PropertyProcessor/Property/BaseProcessor.php
index b11d4ea..65eda43 100644
--- a/src/PropertyProcessor/Property/BaseProcessor.php
+++ b/src/PropertyProcessor/Property/BaseProcessor.php
@@ -168,7 +168,9 @@ protected function addPatternPropertiesValidator(JsonSchema $propertySchema): vo
         }
 
         foreach ($json['patternProperties'] as $pattern => $schema) {
-            if (@preg_match("/$pattern/", '') === false) {
+            $escapedPattern = addcslashes($pattern, '/');
+
+            if (@preg_match("/$escapedPattern/", '') === false) {
                 throw new SchemaException(
                     "Invalid pattern '$pattern' for pattern property in file {$propertySchema->getFile()}"
                 );
diff --git a/src/SchemaProcessor/PostProcessor/Internal/ExtendObjectPropertiesMatchingPatternPropertiesPostProcessor.php b/src/SchemaProcessor/PostProcessor/Internal/ExtendObjectPropertiesMatchingPatternPropertiesPostProcessor.php
index 8083528..2ddc964 100644
--- a/src/SchemaProcessor/PostProcessor/Internal/ExtendObjectPropertiesMatchingPatternPropertiesPostProcessor.php
+++ b/src/SchemaProcessor/PostProcessor/Internal/ExtendObjectPropertiesMatchingPatternPropertiesPostProcessor.php
@@ -43,7 +43,7 @@ public function getCode(PropertyInterface $property, bool $batchUpdate = false):
                 {
                     $json = $this->schema->getJsonSchema()->getJson();
                     // A batch update must execute the base validators to check the integrity of the object.
-                    // Consequently the schema hook must not add validation code in that places.
+                    // Consequently, the schema hook must not add validation code in that places.
                     if ($batchUpdate || !isset($json['patternProperties'])) {
                         return '';
                     }
@@ -51,7 +51,7 @@ public function getCode(PropertyInterface $property, bool $batchUpdate = false):
                     $matchesAnyPattern = false;
 
                     foreach (array_keys($json['patternProperties']) as $pattern) {
-                        if (preg_match("/{$pattern}/", $property->getName())) {
+                        if (preg_match('/' . addcslashes($pattern, '/') . '/', $property->getName())) {
                             $matchesAnyPattern = true;
                         }
                     }
@@ -107,8 +107,11 @@ function (Validator $validator): bool {
 
             /** @var PatternPropertiesValidator $patternPropertiesValidator */
             foreach ($patternPropertiesValidators as $patternPropertiesValidator) {
-                if (!preg_match("/{$patternPropertiesValidator->getPattern()}/", $property->getName()) ||
-                    !isset(
+                if (!preg_match(
+                        '/' . addcslashes($patternPropertiesValidator->getPattern(), '/') . '/',
+                        $property->getName()
+                    )
+                    || !isset(
                         $schema->getJsonSchema()->getJson()
                             ['patternProperties']
                             [$patternPropertiesValidator->getPattern()]
diff --git a/src/SchemaProcessor/PostProcessor/Internal/PatternPropertiesPostProcessor.php b/src/SchemaProcessor/PostProcessor/Internal/PatternPropertiesPostProcessor.php
index c664989..a2f631d 100644
--- a/src/SchemaProcessor/PostProcessor/Internal/PatternPropertiesPostProcessor.php
+++ b/src/SchemaProcessor/PostProcessor/Internal/PatternPropertiesPostProcessor.php
@@ -53,7 +53,7 @@ public function process(Schema $schema, GeneratorConfiguration $generatorConfigu
                     $schema->getProperties(),
                     function (array $carry, PropertyInterface $property) use ($schemaProperties, $validator): array {
                         if (in_array($property->getName(), $schemaProperties) &&
-                            preg_match("/{$validator->getPattern()}/", $property->getName())
+                            preg_match('/' . addcslashes($validator->getPattern(), '/') . '/', $property->getName())
                         ) {
                             $carry[] = $property;
                         }
diff --git a/src/Templates/Validator/PatternProperties.phptpl b/src/Templates/Validator/PatternProperties.phptpl
index 016d258..c947890 100644
--- a/src/Templates/Validator/PatternProperties.phptpl
+++ b/src/Templates/Validator/PatternProperties.phptpl
@@ -7,7 +7,7 @@
 
     foreach ($properties as $propertyKey => $value) {
         try {
-            if (!preg_match("{{ pattern }}", $propertyKey)) {
+            if (!preg_match(base64_decode('{{ pattern }}'), $propertyKey)) {
                 continue;
             }
 
diff --git a/tests/Basic/PatternPropertiesTest.php b/tests/Basic/PatternPropertiesTest.php
index d298702..91e5cdb 100644
--- a/tests/Basic/PatternPropertiesTest.php
+++ b/tests/Basic/PatternPropertiesTest.php
@@ -21,7 +21,7 @@ public function testInvalidPatternThrowsAnException(): void
         $this->expectException(SchemaException::class);
         $this->expectExceptionMessageMatches("/Invalid pattern 'ab\[c' for pattern property in file .*\.json/");
 
-        $this->generateClassFromFile('InvalidPattern.json');
+        $this->generateClassFromFileTemplate('PatternProperty.json', ['ab[c']);
     }
 
     /**
@@ -85,4 +85,15 @@ public function testMultipleTransformingFiltersForPatternPropertiesAndObjectProp
 
         $this->generateClassFromFile('MultipleTransformingFilters.json');
     }
+
+    /**
+     * https://github.com/wol-soft/php-json-schema-model-generator/issues/65
+     */
+    public function testPatternEscaping(): void
+    {
+        $className = $this->generateClassFromFileTemplate('PatternProperty.json', ['a/(b|c)']);
+        $object = new $className(['a/b' => 'Hello']);
+
+        $this->assertSame(['a/b' => 'Hello'], $object->getRawModelDataInput());
+    }
 }
diff --git a/tests/Schema/PatternPropertiesTest/InvalidPattern.json b/tests/Schema/PatternPropertiesTest/PatternProperty.json
similarity index 85%
rename from tests/Schema/PatternPropertiesTest/InvalidPattern.json
rename to tests/Schema/PatternPropertiesTest/PatternProperty.json
index 2bdd2d7..776a4fb 100644
--- a/tests/Schema/PatternPropertiesTest/InvalidPattern.json
+++ b/tests/Schema/PatternPropertiesTest/PatternProperty.json
@@ -1,7 +1,7 @@
 {
   "type": "object",
   "patternProperties": {
-    "ab[c": {
+    "%s": {
       "type": "string"
     }
   }