diff --git a/modules/openapi-generator/src/main/resources/Javascript/libraries/javascript/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Javascript/libraries/javascript/ApiClient.mustache
index c3f9993e0d0..542398b7f03 100644
--- a/modules/openapi-generator/src/main/resources/Javascript/libraries/javascript/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Javascript/libraries/javascript/ApiClient.mustache
@@ -160,7 +160,7 @@ class ApiClient {
             url = apiBasePath + path;
         }
 
-        url = url.replace(/\{([\w-\.]+)\}/g, (fullMatch, key) => {
+        url = url.replace(/\{([\w-\.#]+)\}/g, (fullMatch, key) => {
             var value;
             if (pathParams.hasOwnProperty(key)) {
                 value = this.paramToString(pathParams[key]);
diff --git a/samples/client/petstore/javascript-es6/src/ApiClient.js b/samples/client/petstore/javascript-es6/src/ApiClient.js
index 8c58f5c4911..271dc70cf0e 100644
--- a/samples/client/petstore/javascript-es6/src/ApiClient.js
+++ b/samples/client/petstore/javascript-es6/src/ApiClient.js
@@ -159,7 +159,7 @@ class ApiClient {
             url = apiBasePath + path;
         }
 
-        url = url.replace(/\{([\w-\.]+)\}/g, (fullMatch, key) => {
+        url = url.replace(/\{([\w-\.#]+)\}/g, (fullMatch, key) => {
             var value;
             if (pathParams.hasOwnProperty(key)) {
                 value = this.paramToString(pathParams[key]);
diff --git a/samples/client/petstore/javascript-promise-es6/src/ApiClient.js b/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
index 44d8c46bc33..12762f0d47c 100644
--- a/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
+++ b/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
@@ -159,7 +159,7 @@ class ApiClient {
             url = apiBasePath + path;
         }
 
-        url = url.replace(/\{([\w-\.]+)\}/g, (fullMatch, key) => {
+        url = url.replace(/\{([\w-\.#]+)\}/g, (fullMatch, key) => {
             var value;
             if (pathParams.hasOwnProperty(key)) {
                 value = this.paramToString(pathParams[key]);