diff --git a/src/schema-routes/schema-routes.js b/src/schema-routes/schema-routes.js
index c0dac382..2435e642 100644
--- a/src/schema-routes/schema-routes.js
+++ b/src/schema-routes/schema-routes.js
@@ -110,7 +110,7 @@ class SchemaRoutes {
       originalRouteName;
 
     const pathParamMatches = (routeName || '').match(
-      /({(([A-z]){1}([a-zA-Z0-9-_.]-?_?\.?)+)([0-9]+)?})|(:(([A-z]){1}([a-zA-Z0-9-_.]-?_?\.?)+)([0-9]+)?:?)/g,
+      /({[a-zA-Z]([a-zA-Z0-9-_.])*})|(:[a-zA-Z]([-_.]?[a-zA-Z0-9-_.])*:?)/g,
     );
 
     // used in case when path parameters is not declared in requestInfo.parameters ("in": "path")
diff --git a/tests/spec/extractRequestParams/expected.ts b/tests/spec/extractRequestParams/expected.ts
index 58667e22..f6994d97 100644
--- a/tests/spec/extractRequestParams/expected.ts
+++ b/tests/spec/extractRequestParams/expected.ts
@@ -496,6 +496,27 @@ export class Api<SecurityDataType extends unknown> extends HttpClient<SecurityDa
         format: "json",
         ...params,
       }),
+
+    /**
+     * @description Get public details of an Authentiq ID.
+     *
+     * @tags key, get
+     * @name UnderlinesDetail
+     * @request GET:/i_key/underlines/{i__UK}
+     */
+    underlinesDetail: (iUk: string, params: RequestParams = {}) =>
+      this.request<
+        {
+          /** base64safe encoded public signing key */
+          sub?: string;
+        },
+        Error
+      >({
+        path: `/i_key/underlines/${iUk}`,
+        method: "GET",
+        format: "json",
+        ...params,
+      }),
   };
   login = {
     /**
diff --git a/tests/spec/extractRequestParams/schema.json b/tests/spec/extractRequestParams/schema.json
index a3982337..8d4d5098 100644
--- a/tests/spec/extractRequestParams/schema.json
+++ b/tests/spec/extractRequestParams/schema.json
@@ -56,6 +56,13 @@
       "required": true,
       "type": "string"
     },
+    "i__UK": {
+      "description": "Variable with double __ in it.",
+      "in": "path",
+      "name": "i__UK",
+      "required": true,
+      "type": "string"
+    },
     "i_PK": {
       "description": "Public Signing Key - Authentiq ID (43 chars)",
       "in": "path",
@@ -480,6 +487,36 @@
         "tags": ["key", "get"]
       }
     },
+    "/i_key/underlines/{i__UK}": {
+      "get": {
+        "description": "Get public details of an Authentiq ID.\n",
+        "parameters": [
+          {
+            "$ref": "#/parameters/i__UK"
+          }
+        ],
+        "produces": ["application/json"],
+        "responses": {
+          "200": {
+            "description": "Successfully retrieved",
+            "schema": {
+              "properties": {
+                "sub": {
+                  "description": "base64safe encoded public signing key",
+                  "type": "string"
+                }
+              },
+              "title": "JWT",
+              "type": "object"
+            }
+          },
+          "default": {
+            "$ref": "#/responses/ErrorResponse"
+          }
+        },
+        "tags": ["key", "get"]
+      }
+    },
     "/login": {
       "post": {
         "consumes": ["application/jwt"],
diff --git a/tests/spec/extractRequestParams/schema.ts b/tests/spec/extractRequestParams/schema.ts
index 58667e22..f6994d97 100644
--- a/tests/spec/extractRequestParams/schema.ts
+++ b/tests/spec/extractRequestParams/schema.ts
@@ -496,6 +496,27 @@ export class Api<SecurityDataType extends unknown> extends HttpClient<SecurityDa
         format: "json",
         ...params,
       }),
+
+    /**
+     * @description Get public details of an Authentiq ID.
+     *
+     * @tags key, get
+     * @name UnderlinesDetail
+     * @request GET:/i_key/underlines/{i__UK}
+     */
+    underlinesDetail: (iUk: string, params: RequestParams = {}) =>
+      this.request<
+        {
+          /** base64safe encoded public signing key */
+          sub?: string;
+        },
+        Error
+      >({
+        path: `/i_key/underlines/${iUk}`,
+        method: "GET",
+        format: "json",
+        ...params,
+      }),
   };
   login = {
     /**