diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 3a90ef15460..d6eddb057fa 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -3856,6 +3856,11 @@ public class DefaultCodegen implements CodegenConfig {
         // input name and age => input_name_and_age
         name = name.replaceAll(" ", "_");
 
+        // /api/films/get => _api_films_get
+        // \api\films\get => _api_films_get
+        name = name.replaceAll("/", "_");
+        name = name.replaceAll("\\\\", "_");
+
         // remove everything else other than word, number and _
         // $php_variable => php_variable
         if (allowUnicodeIdentifiers) { //could be converted to a single line with ?: operator
diff --git a/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/API/Fake.hs b/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/API/Fake.hs
index 78f572d069e..9e8a52b2522 100644
--- a/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/API/Fake.hs
+++ b/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/API/Fake.hs
@@ -82,11 +82,11 @@ instance HasBodyParam CreateXmlItem XmlItem
 -- | @application/xml@
 instance Consumes CreateXmlItem MimeXML
 -- | @text/xml@
-instance Consumes CreateXmlItem MimeTextxml
+instance Consumes CreateXmlItem MimeTextXml
 -- | @text/xml; charset=utf-8@
-instance Consumes CreateXmlItem MimeTextxmlCharsetutf8
+instance Consumes CreateXmlItem MimeTextXmlCharsetutf8
 -- | @text/xml; charset=utf-16@
-instance Consumes CreateXmlItem MimeTextxmlCharsetutf16
+instance Consumes CreateXmlItem MimeTextXmlCharsetutf16
 -- | @application/xml; charset=utf-8@
 instance Consumes CreateXmlItem MimeXmlCharsetutf8
 -- | @application/xml; charset=utf-16@
diff --git a/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/MimeTypes.hs b/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/MimeTypes.hs
index ee02f76b03b..09a22f66398 100644
--- a/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/MimeTypes.hs
+++ b/samples/client/petstore/haskell-http-client/lib/OpenAPIPetstore/MimeTypes.hs
@@ -223,33 +223,33 @@ instance MimeType MimeXmlCharsetutf8 where
 -- instance MimeRender MimeXmlCharsetutf8 T.Text where mimeRender _ = undefined
 -- instance MimeUnrender MimeXmlCharsetutf8 T.Text where mimeUnrender _ = undefined
 
--- ** MimeTextxml
+-- ** MimeTextXml
 
-data MimeTextxml = MimeTextxml deriving (P.Typeable)
+data MimeTextXml = MimeTextXml deriving (P.Typeable)
 
 -- | @text/xml@
-instance MimeType MimeTextxml where
+instance MimeType MimeTextXml where
   mimeType _ = Just $ P.fromString "text/xml"
--- instance MimeRender MimeTextxml T.Text where mimeRender _ = undefined
--- instance MimeUnrender MimeTextxml T.Text where mimeUnrender _ = undefined
+-- instance MimeRender MimeTextXml T.Text where mimeRender _ = undefined
+-- instance MimeUnrender MimeTextXml T.Text where mimeUnrender _ = undefined
 
--- ** MimeTextxmlCharsetutf16
+-- ** MimeTextXmlCharsetutf16
 
-data MimeTextxmlCharsetutf16 = MimeTextxmlCharsetutf16 deriving (P.Typeable)
+data MimeTextXmlCharsetutf16 = MimeTextXmlCharsetutf16 deriving (P.Typeable)
 
 -- | @text/xml; charset=utf-16@
-instance MimeType MimeTextxmlCharsetutf16 where
+instance MimeType MimeTextXmlCharsetutf16 where
   mimeType _ = Just $ P.fromString "text/xml; charset=utf-16"
--- instance MimeRender MimeTextxmlCharsetutf16 T.Text where mimeRender _ = undefined
--- instance MimeUnrender MimeTextxmlCharsetutf16 T.Text where mimeUnrender _ = undefined
+-- instance MimeRender MimeTextXmlCharsetutf16 T.Text where mimeRender _ = undefined
+-- instance MimeUnrender MimeTextXmlCharsetutf16 T.Text where mimeUnrender _ = undefined
 
--- ** MimeTextxmlCharsetutf8
+-- ** MimeTextXmlCharsetutf8
 
-data MimeTextxmlCharsetutf8 = MimeTextxmlCharsetutf8 deriving (P.Typeable)
+data MimeTextXmlCharsetutf8 = MimeTextXmlCharsetutf8 deriving (P.Typeable)
 
 -- | @text/xml; charset=utf-8@
-instance MimeType MimeTextxmlCharsetutf8 where
+instance MimeType MimeTextXmlCharsetutf8 where
   mimeType _ = Just $ P.fromString "text/xml; charset=utf-8"
--- instance MimeRender MimeTextxmlCharsetutf8 T.Text where mimeRender _ = undefined
--- instance MimeUnrender MimeTextxmlCharsetutf8 T.Text where mimeUnrender _ = undefined
+-- instance MimeRender MimeTextXmlCharsetutf8 T.Text where mimeRender _ = undefined
+-- instance MimeUnrender MimeTextXmlCharsetutf8 T.Text where mimeUnrender _ = undefined
 
diff --git a/samples/client/petstore/javascript-es6/package.json b/samples/client/petstore/javascript-es6/package.json
index ae6e93fe8dc..c89469d525c 100644
--- a/samples/client/petstore/javascript-es6/package.json
+++ b/samples/client/petstore/javascript-es6/package.json
@@ -1,7 +1,7 @@
 {
   "name": "open_api_petstore",
   "version": "1.0.0",
-  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__",
+  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___",
   "license": "Apache-2.0",
   "main": "dist/index.js",
   "scripts": {
diff --git a/samples/client/petstore/javascript-es6/src/index.js b/samples/client/petstore/javascript-es6/src/index.js
index 51e8d4b9f81..e4e2a2fb113 100644
--- a/samples/client/petstore/javascript-es6/src/index.js
+++ b/samples/client/petstore/javascript-es6/src/index.js
@@ -66,7 +66,7 @@ import UserApi from './api/UserApi';
 
 
 /**
-* This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__.<br>
+* This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___.<br>
 * The <code>index</code> module provides access to constructors for all the classes which comprise the public API.
 * <p>
 * An AMD (recommended!) or CommonJS application will generally do something equivalent to the following:
diff --git a/samples/client/petstore/javascript-promise-es6/package.json b/samples/client/petstore/javascript-promise-es6/package.json
index ae6e93fe8dc..c89469d525c 100644
--- a/samples/client/petstore/javascript-promise-es6/package.json
+++ b/samples/client/petstore/javascript-promise-es6/package.json
@@ -1,7 +1,7 @@
 {
   "name": "open_api_petstore",
   "version": "1.0.0",
-  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__",
+  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___",
   "license": "Apache-2.0",
   "main": "dist/index.js",
   "scripts": {
diff --git a/samples/client/petstore/javascript-promise-es6/src/index.js b/samples/client/petstore/javascript-promise-es6/src/index.js
index 51e8d4b9f81..e4e2a2fb113 100644
--- a/samples/client/petstore/javascript-promise-es6/src/index.js
+++ b/samples/client/petstore/javascript-promise-es6/src/index.js
@@ -66,7 +66,7 @@ import UserApi from './api/UserApi';
 
 
 /**
-* This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__.<br>
+* This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___.<br>
 * The <code>index</code> module provides access to constructors for all the classes which comprise the public API.
 * <p>
 * An AMD (recommended!) or CommonJS application will generally do something equivalent to the following:
diff --git a/samples/client/petstore/javascript-promise/package.json b/samples/client/petstore/javascript-promise/package.json
index 9c4bc8eedd0..86b2083c680 100644
--- a/samples/client/petstore/javascript-promise/package.json
+++ b/samples/client/petstore/javascript-promise/package.json
@@ -1,7 +1,7 @@
 {
   "name": "open_api_petstore",
   "version": "1.0.0",
-  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__",
+  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___",
   "license": "Apache-2.0",
   "main": "src/index.js",
   "scripts": {
diff --git a/samples/client/petstore/javascript-promise/src/index.js b/samples/client/petstore/javascript-promise/src/index.js
index 85a6c371d79..b7f8ca6bbf8 100644
--- a/samples/client/petstore/javascript-promise/src/index.js
+++ b/samples/client/petstore/javascript-promise/src/index.js
@@ -25,7 +25,7 @@
   'use strict';
 
   /**
-   * This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__.<br>
+   * This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___.<br>
    * The <code>index</code> module provides access to constructors for all the classes which comprise the public API.
    * <p>
    * An AMD (recommended!) or CommonJS application will generally do something equivalent to the following:
diff --git a/samples/client/petstore/javascript/package.json b/samples/client/petstore/javascript/package.json
index 9c4bc8eedd0..86b2083c680 100644
--- a/samples/client/petstore/javascript/package.json
+++ b/samples/client/petstore/javascript/package.json
@@ -1,7 +1,7 @@
 {
   "name": "open_api_petstore",
   "version": "1.0.0",
-  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__",
+  "description": "This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___",
   "license": "Apache-2.0",
   "main": "src/index.js",
   "scripts": {
diff --git a/samples/client/petstore/javascript/src/index.js b/samples/client/petstore/javascript/src/index.js
index 85a6c371d79..b7f8ca6bbf8 100644
--- a/samples/client/petstore/javascript/src/index.js
+++ b/samples/client/petstore/javascript/src/index.js
@@ -25,7 +25,7 @@
   'use strict';
 
   /**
-   * This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters__.<br>
+   * This_spec_is_mainly_for_testing_Petstore_server_and_contains_fake_endpoints_models__Please_do_not_use_this_for_any_other_purpose__Special_characters___.<br>
    * The <code>index</code> module provides access to constructors for all the classes which comprise the public API.
    * <p>
    * An AMD (recommended!) or CommonJS application will generally do something equivalent to the following: